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Question : Find the fourth proportion for 15, 55, and 81.

Option 1: 231

Option 2: 297

Option 3: 335

Option 4: 313


Team Careers360 11th Jan, 2024
Answer (1)
Team Careers360 21st Jan, 2024

Correct Answer: 297


Solution : Assuming the fourth proportion is $x$.
15 : 55 :: 81 : $x$
⇒ $\frac{15}{55}$ = $\frac{81}{x}$
⇒ $x$ = $\frac{81×55}{15}$
⇒ $x$ = 297
Hence, the correct answer is 297.

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