With a median price-to-earnings (or "P/E") ratio of close to 17x in the United States, you could be forgiven for feeling indifferent about Strategic Education, Inc.'s (NASDAQ:STRA) P/E ratio of 19.2x. While this might not raise any eyebrows, if the P/E ratio is not justified investors could be missing out on a potential opportunity or ignoring looming disappointment.

With its earnings growth in positive territory compared to the declining earnings of most other companies, Strategic Education has been doing quite well of late. It might be that many expect the strong earnings performance to deteriorate like the rest, which has kept the P/E from rising. If not, then existing shareholders have reason to be feeling optimistic about the future direction of the share price.

Does Growth Match The P/E?

There's an inherent assumption that a company should be matching the market for P/E ratios like Strategic Education's to be considered reasonable.

If we review the last year of earnings growth, the company posted a terrific increase of 221%. Pleasingly, EPS has also lifted 146% in aggregate from three years ago, thanks to the last 12 months of growth. Therefore, it's fair to say the earnings growth recently has been superb for the company.

Looking ahead now, EPS is anticipated to climb by 4.5% during the coming year according to the four analysts following the company. Meanwhile, the rest of the market is forecast to expand by 15%, which is noticeably more attractive.

In light of this, it's curious that Strategic Education's P/E sits in line with the majority of other companies. It seems most investors are ignoring the fairly limited growth expectations and are willing to pay up for exposure to the stock. Maintaining these prices will be difficult to achieve as this level of earnings growth is likely to weigh down the shares eventually.

What We Can Learn From Strategic Education's P/E?

We'd say the price-to-earnings ratio's power isn't primarily as a valuation instrument but rather to gauge current investor sentiment and future expectations.

We've established that Strategic Education currently trades on a higher than expected P/E since its forecast growth is lower than the wider market. Right now we are uncomfortable with the P/E as the predicted future earnings aren't likely to support a more positive sentiment for long. This places shareholders' investments at risk and potential investors in danger of paying an unnecessary premium.

There are also other vital risk factors to consider before investing and we've discovered 1 warning sign for Strategic Education that you should be aware of.

It's important to make sure you look for a great company, not just the first idea you come across. So take a peek at this free list of interesting companies with strong recent earnings growth (and a low P/E).

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.