SSC CGL 23 Aug 2021 Shift 1 Paper

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Question : 72 of 100

Marks: +1, -0

Fourth proportion to

12,18,6

is equal to the third proportion to

4, k

. What is the value of

k

?

$6.5$
4
6
$4 √{3}$

Solution:

Let Fourth proportion of 12,18 and 6 is

x

.
Then,

⇒ \;\; \;{12}/{18}=\;{6}/{x}

∴ \;\; x=\;{18}/{2}=9

x=9

is third proportion of 4 and

{k}

.
The value of

{K}

is

\;{4}/{k}=\;{k}/{x}

\;{4}/{k} \;\; =\;{k}/{9}

⇒ \;\; k \;\; =36

k \;\; =6

The value of

k

is 6 .

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