which of these fraction are proportional relationship , 1/2 and 2/3 , 1/2 and 2/4, 3/4 and  9/12, 5/4 and 2/3 , 4/5 and 20/25, 1/7 and 33/50 , which of these are are nonproportional relationship , 3/4 and 10/15, 3/4 and 9/12, 3/2 and 6/4, 4/5 and 20/25, 6/7 and 13/20, 8/9 and 16/18.

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