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Question

Find the fourth proportion to 1.2, 1.6 and 7.2.


A

9.6

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B

6.9

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C

5.4

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D

2.6

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Solution

The correct option is D

2.6


Let the fourth proportion be x.
Then, 1.2, 1.6, 7.2, x are in proportion.

Product of means = Product of extremes
1.6×7.2=x×1.2
1.2x=1.6×7.2
x=1.6×7.21.2
x=9.6


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