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Which ratios form a proportion?

A: 3/15, 12/55
B: 8/24, 12/35
C: 5/18, 25/90 **
D: 4/11, 16/25

1 answer

To see if two fractions a/b and c/d are in the same proportion
take the cross-product ad and bc
If they are equal, the ratios form a proportion, so checking yours

5/18 vs 25/90
5*90 vs 18*25
450 = 450 , you are correct

checking one more:
4/11 vs 16/25
4*25 = 11*16 ?
100 = 176 , nope!
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