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Finding the Fourth Proportional to 520.38, 781.07 and 405.27

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Solution

The fourth proportional to 520.38, 781.07 and 405.27 is: 608.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.38 : 781.07 = 405.27 : x
  2. Step 2: Convert to fraction form
    520.38/781.07 = 405.27/x
  3. Step 3: Cross multiply
    520.38x = 781.07 × 405.27
  4. Step 4: Simplify right side
    520.38x = 316,542.21
  5. Step 5: Solve for x
    x = 316,542.21/520.38
  6. Step 6: Final answer
    x = 608.29

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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.