Question

if 9 ,x,x,49 are in proportion , find the value of x.

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Answer 1

$9 : x :: x :49 \\ \\ {x}^{2} = 49 \times 9 \\ \\ {x}^{2} = 441 \\ \\ x = \sqrt{441} \\ \\ x = 21$






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Answer 2

9 : x :: x : 49

${x}^{2} = 49 \times 9$

${x}^{2} = 441$

$x = \sqrt{441}$

$x = 21$