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Finding the Fourth Proportional to 261.97, 393 and 170.71

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Solution

The fourth proportional to 261.97, 393 and 170.71 is: 256.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    261.97 : 393 = 170.71 : x
  2. Step 2: Convert to fraction form
    261.97/393 = 170.71/x
  3. Step 3: Cross multiply
    261.97x = 393 × 170.71
  4. Step 4: Simplify right side
    261.97x = 67,089.03
  5. Step 5: Solve for x
    x = 67,089.03/261.97
  6. Step 6: Final answer
    x = 256.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.