Question
Find the fourth proportion to 1.2, 1.6 and 7.2.
Answer: Option D
:
D
Let the fourth proportionbe x.
Then, 1.2,1.6, 7.2, x are in proportion.
Product of means = Product of extremes
⇒1.6×7.2=x×1.2
⇒1.2x=1.6×7.2
⇒x=1.6×7.21.2
⇒x=9.6
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:
D
Let the fourth proportionbe x.
Then, 1.2,1.6, 7.2, x are in proportion.
Product of means = Product of extremes
⇒1.6×7.2=x×1.2
⇒1.2x=1.6×7.2
⇒x=1.6×7.21.2
⇒x=9.6
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