Question

Find the mean proportional between 20 and 80

Answer 1

1000

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Answer 2

40

Step-by-step explanation:

20,x,x,80 should be mean proportion

So,

Product of means = products of extreme

X² =20 * 80= 1600

X= under square root (1600)

$\sqrt{1600} = \sqrt{40 \times 40} = 40$

20,40,40 & 80 are in proportion

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