Question

9:x::x:49 are in proportion then find x

Answer 1

9 : x : x : 49

9 × 49 = x2

√9 × 49 = x

x = 3 × 7

x = 21.

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Answer 2

Product of means is equals to the product of the extremes
Therefore
(X)(X)=(9)(49)
∴x²=7²×3²
X²=21²
∴x=21


Hope it helps...!