Description: Given a table of ratios, watch as we test them for equivalence and determine whether the relationship is proportional. Created by Sal Khan. Test the ratios for equivalents, and determine whether the relationship is proportional. Well, you have a proportional relationship between the number of servings and the number of tomatoes is if the ratio of the number of servings to the number of tomatoes is always the same. Or if the ratio of the number of tomatoes to the number of servings is always the same.*Teacher Advisor is 100% free.