Arcosa, Inc.'s (NYSE:ACA) price-to-earnings (or "P/E") ratio of 41.3x might make it look like a strong sell right now compared to the market in the United States, where around half of the companies have P/E ratios below 19x and even P/E's below 11x are quite common. Nonetheless, we'd need to dig a little deeper to determine if there is a rational basis for the highly elevated P/E.

Arcosa hasn't been tracking well recently as its declining earnings compare poorly to other companies, which have seen some growth on average. One possibility is that the P/E is high because investors think this poor earnings performance will turn the corner. If not, then existing shareholders may be extremely nervous about the viability of the share price.

Does Growth Match The High P/E?

Arcosa's P/E ratio would be typical for a company that's expected to deliver very strong growth, and importantly, perform much better than the market.

Retrospectively, the last year delivered a frustrating 55% decrease to the company's bottom line. However, a few very strong years before that means that it was still able to grow EPS by an impressive 79% in total over the last three years. So we can start by confirming that the company has generally done a very good job of growing earnings over that time, even though it had some hiccups along the way.

Turning to the outlook, the next year should generate growth of 46% as estimated by the five analysts watching the company. With the market only predicted to deliver 15%, the company is positioned for a stronger earnings result.

With this information, we can see why Arcosa is trading at such a high P/E compared to the market. It seems most investors are expecting this strong future growth and are willing to pay more for the stock.

What We Can Learn From Arcosa's P/E?

Using the price-to-earnings ratio alone to determine if you should sell your stock isn't sensible, however it can be a practical guide to the company's future prospects.

As we suspected, our examination of Arcosa's analyst forecasts revealed that its superior earnings outlook is contributing to its high P/E. Right now shareholders are comfortable with the P/E as they are quite confident future earnings aren't under threat. Unless these conditions change, they will continue to provide strong support to the share price.

Plus, you should also learn about this 1 warning sign we've spotted with Arcosa.

Of course, you might also be able to find a better stock than Arcosa. So you may wish to see this free collection of other companies that have reasonable P/E ratios and have grown earnings strongly.

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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.