Question

First, Second and third terms of a proportion are respectively 20, 18 and 40. Find its fourth term.​

Answer 1

Answer:

the fourth term is 36.

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Answer 2

The fourth term is 36.

Step-by-step explanation:

Given : First, Second and third terms of a proportion are respectively 20, 18 and 40.

To find : The fourth term ?

Solution :

If the four terms are in proportion $a:b:: c:d$ then $\frac{a}{b}=\frac{c}{d}$

First, Second and third terms of a proportion are respectively 20, 18 and 40.

i.e. a=20, b=18 and c=40

Substitute,

$\frac{20}{18}=\frac{40}{d}$

$d=\frac{40\times 18}{20}$

$d=36$

Therefore, the fourth term is 36.

#Learn more

In a proportion , the 1st, 2nd and 4th terms are 51,68,108 respectively. Find the 3rd term.

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