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When two amounts are matching when one or the other of each the two amounts increases or decreases.
equal ratios say for every bag, you get 5 balls or 1/5 say that now you have 10 bags, you now have 50 balls 1/5 = 10/50 PROPORTIONAL
You could find out how to keep shapes proportional. For some more ideas you can talk to your teacher, look at past ideas, or look online.
It is an expression, not an equation and so cannot be proportional nor non-proportional.
Directly proportional relationship is F=ma, F is directly proportional to a. Inversely proportional relationship is v=r/t, v is inversely proportional to t.