To find a company's financial ratios, see Finding Financial Ratios for Companies.
Note that, as mentioned in the guide, Hoovers' Ratio Comparisons link, when available for a company, will let you compare a company's financial ratios against those of its industry and also its sector.
To find financial ratios for an industry, see Finding Financial Ratios for Industries.
Note that not all ratios are available in all databases; you may need to use multiple databases in order to find the ratios that you've been asked to find for a class assignment.
The video below shows how to use Hoovers and IBISWorld to find financial ratios, using BHP Group as an example.