How do you find ratios?

Answer 1

you have to have half a whole number and then you divide
you take the number that is gone or that is still there in put it over the total number.
to find the ration you divide the diameter by half.

Answer 2

Proportions are built from ratios.A ratio is just a comparison between two different things. For instance, someone can look at a group of people and refer to the ratio of men to women in the group.Suppose there are thirty-five people, fifteen of whom are men.Then the ratio of men to women is 15 to 20, which in math terms is 15:20.