To form a proportion, the cross-products of the two ratios must be equal.
For A: (4/20)(2/5) = 8/100 = 0.08
For B: (4/20)(1/5) = 4/100 = 0.04
For C: (20/4)(1/5) = 20/20 = 1
For D: (20/4)(2/5) = 40/20 = 2
Therefore, the ratios that form a proportion are A. 4/20 and 2/5.
Which two ratios form a proportion? A. 4/20 and 2/5 B. 4/20 and 1/5 C. 20/4 and 1/5 D. 20/4 and 2/5
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