What is the difference between rates and

A rate often involves time:  e. g., 33 feet per second; also, we are finding the ratio of one type of measurement with respect to another:  distance and time.

A proportion is often the ratio of different measures of the same thing:

e. g.   5 apples
         
           7 apples

You're doing something i dont know how to do but search up on google slope calculator maybe that will get you there