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There are 36 yellow marbles.

proportion: a:b = c:d where ad = bc

7:9 = 28:x

7x = 928
7x = 252
7x/7 = 252/7
x = 36

7:9 = 28:36
736 = 9*28
252 = 252

Ratio:  7:9

Blue marbles to yellow marbles. 

28 blue marbles 

74 = 28
94 = 36

28:36

Answer: There are 36 yellow marbles 

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