Two ratios, a:b and c:d are proportional if there is some number x such that a = cx and b = dx.
Equivalently, if ad = bc (each is equal to cdx).
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They are equivalent.
Yes
They are ratios like 2 over 1 that would represent 20 gallons to 1 gallon sugar
rational number
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