Which of the following ratios is in proportion.

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A 1:2::2:6
B 100:1::1:100
C 10:20::2000:4000
D 6:7::7:6

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Answer: C. 10:20::2000:4000

Four numbers are in proportion if both ratios simplify to the same ratio. 10:20 = 1:2 and 2000:4000 = 1:2, so they are equal. In option a, 1:2 is not equal to 2:6 = 1:3.

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Which of the following ratios is in proportion.

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