Sainik School Entrance Exam 2018 Solved Paper

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Question : 142 of 150

Marks: +1, -0

Find the fourth proportional to 3, 7 and 9,

23
27
21
None of these

Solution:

(c) Let the fourth proportional =

a

∵

3,7,9

and

a

are in proportional.
∴

3/7 = 9/a

⇒

3a = 7×9

⇒

a= {7×9}/3 = 21

So, the fourth proportional = 21

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