SSC CGL 18 Aug 2021 Shift 2 Paper

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Question : 56 of 100

Marks: +1, -0

Find the ratio between the fourth proportional of

12,16,6

and the third proportional of 4,6 .

$4: 3$
$3: 2$
$11: 5$
$8: 9$

Solution:

Let Fourth proportional of 12,16 , 6 , is

x

.
Then,

\;{12}/{16}=\;{6}/{x}

⇒ \;\; x=\;{16 × 6}/{12} ⇒ 8=x

Let the third proportional of 4,6 , is

y

.
Then,

\;{4}/{6}=\;{6}/{y} ⇒ y=\;{6 × 6}/{4}

⇒ \;\; y=9

∴ \;\text " Ratio "\;=x: y=8: 9

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