Question

Find x in the following proportion 4 , x , x , 16​

Answer 1

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Your answer is :

4, 8, 12, 16
So, x =8and x=12
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Answer 2

Given proportion is

$4,x,x,16$

Since the given series is in proportion so we can write the given series in a following manner

We will multiply $x$ with $x$ and $4$ with $16$

$x\times x=4\times 16\\x^{2} =64\\x=\sqrt{64} \\x=8$

Now the value of $x$ in the given proportion is $8$