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Sainik School Entrance Exam 2018 Solved Paper
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© examsnet.com
Question : 142
Total: 150
Find the fourth proportional to 3, 7 and 9,
23
27
21
None of these
Validate
Solution:
(c) Let the fourth proportional =
a
∵
3
,
7
,
9
and
a
are in proportional.
∴
3
7
=
9
a
⇒
3
a
=
7
×
9
⇒
a
=
7
×
9
3
=
21
So, the fourth proportional = 21
© examsnet.com
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