State which of the following are in proportion.
a 10:30:: 15:45 b 8:40::5:30 c ?5:20p::75:3 d 50g:2kg::51 :401?

Dear Student,

Ans. Option a) is correct. So, 10 : 30 :: 15 : 45 are in proportion.
When product of means = product of extremes, the given ratios are said to be in proportion.

Here, Product of extremes = 10 × 45 = 450
Product of means = 30 × 15 = 450
Therefore, the product of the extremes is equal to the product of the means.
 Hence, 10 : 30 :: 15 : 45 are in proportion.

Whereas, in all the other options the terms are not in proportion.

Regards

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