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Finding the Fourth Proportional to 521.46, 781.77 and 261.33

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Solution

The fourth proportional to 521.46, 781.77 and 261.33 is: 391.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.46 : 781.77 = 261.33 : x
  2. Step 2: Convert to fraction form
    521.46/781.77 = 261.33/x
  3. Step 3: Cross multiply
    521.46x = 781.77 × 261.33
  4. Step 4: Simplify right side
    521.46x = 204,299.95
  5. Step 5: Solve for x
    x = 204,299.95/521.46
  6. Step 6: Final answer
    x = 391.78

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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.