If 260 is the mean proportion between x and 338, what is the value of x?

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RRB NTPC Graduate Level CBT-I Official Paper (Held On: 05 Jun, 2025 Shift 1)
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  1. 198
  2. 200
  3. 199
  4. 201

Answer (Detailed Solution Below)

Option 2 : 200
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Detailed Solution

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Given:

Mean proportion = 260

Second number = 338

First number = x (to be calculated)

Formula used:

If 260 is the mean proportion between x and 338, then:

Mean proportion = √(x × 338)

Calculation:

260 = √(x × 338)

⇒ 2602 = x × 338

⇒ 67600 = x × 338

⇒ x = 200

∴ The correct answer is option (2).

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