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Question

State whether true or false

Fourth proportion of 5, 7 and 8 is 11.2.

A
True
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B
False
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Solution

The correct option is A True

In a:b::c:d;d is the fourth proportional.
For, 5:7::8:d, product of extremes = product of means
5×d=7×8
d=565=11.2


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