How is the process of finding equivalent ratios like the process of finding equivalent fractions

It is the same process because ratios and fractions are the same. For example, ratio 1 : 3 can be written in the form of fractions as 1/3. Ratio 1 : 4 is fraction 1/4, and so on. So, if you want to find equivalent ratios, you will use the same process as for finding equivalent fractions.

Where is the problem

If gravity is one third on mars then weight also one third on mars