Find the fourth proportional in $14, 21, 4$

6

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4

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Solution

The correct option is A $6$
In $a : b :: c : d; d$ is the fourth proportional.
In, $14 : 21 :: 4 : d$ , product of extremes $=$ product of means
$14 \times d = 21 \times 4$
$d = 6$

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