Question

If the third proportional to 7 and X is 28 ,find the value of x

Answer 1

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Answer 2

Third proportional c = a : b : : b : c

Then, 7 : x : : x : 28

So, $\frac{7}{x}$ = $\frac{x}{28}$

x² = 7 × 28

x = $\sqrt{7}$ × 28

x = $\sqrt{196}$

x = 14


$\therefore {The \: value \: of \: x \: is \: 14}$