Question

find the fourth proportional to 1/3,1/4,1/5

Answer 1

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Answer 2

The fourth proportional is 3/20

Given:

First-term = 1/3

Second term = 1/4

Third term = 1/5

To find:

The fourth proportional

Solution:

Let the fourth proportional be = x

Therefore,

1/3 / 1/4 = 1/5 / x

1/3:1/4 = 1/5:x

This can be written as -

= 1/34× 1/5 = 1/3 × x

= 1/20 = 1/3 x

x = 3/20

Anwer: The fourth proportional is 3/20

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