Final answer:
Ratios are most useful in identifying relationships.
Step-by-step explanation:
Ratios are most useful in identifying relationships. Ratios compare quantities and show how they are related to each other. For example, in a bar graph comparing the populations of different countries, the ratio of the population sizes can help us understand the relationship between the countries. Ratios can also be used to analyze trends and identify differences, but their primary purpose is to reveal relationships.