Question

find the fourth proportional to the number is 5 , 16 and 20​

Answer 1

5:16::20:X

5*X=16*20

5X=320

X=320/5

X=64

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Answer 2

Given:-

• Number = 5, 16 and 20.

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To find:-

• The fourth proportional to the number.

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Solution:-

• There are three numbers. We have to find out the fourth proportional to the numbers. Firstly, we have to take x to the fourth proportional and then we have to find out the fourth proportional.

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Let,

• the fourth proportional be x.

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$\sf\longmapsto{\boxed{\orange{5:16:20:x}}}$

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Therefore,

$\tt\longmapsto{5x = 16 \times 20}$

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$\tt\longmapsto{5x = 320}$

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$\tt\longmapsto{x = \dfrac{320}{5}}$

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$\bf\longmapsto{\boxed{\red{x = 64}}}$

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Hence,

• the fourth proportional is 64.