Question

21, 27 , 14 , _____
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Answer 1

Answer:

18

Step-by-step explanation:

The fourth term of the following proportions 21,27,14​ ?

Let the fourth term be 'x'.

So, the numbers 21,27,14,x are in proportion is 21:27::14:x.

When  then  

Here, a=21, b=27, c=14 and d=x.

Therefore, the fourth proportion is 18.

Answer 2

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To find : The fourth term of the following proportions 21,27,14 ?

Solution :

Let the fourth term be 'x'.

So, the numbers 21,27,14,x are in proportion is 21:27::14:x.

When a:b::c:d then $\frac{a}{b}=\frac{c}{d}$

Here, a=21, b=27, c=14 and d=x.

$\frac{21}{27}=\frac{14}{x} \\ \\ x=\frac{14\times 27}{21}$

∴ x=18

Therefore, the fourth proportion is 18.