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Finding the Fourth Proportional to 520.47, 781.92 and 499.77

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Solution

The fourth proportional to 520.47, 781.92 and 499.77 is: 750.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.47 : 781.92 = 499.77 : x
  2. Step 2: Convert to fraction form
    520.47/781.92 = 499.77/x
  3. Step 3: Cross multiply
    520.47x = 781.92 × 499.77
  4. Step 4: Simplify right side
    520.47x = 390,780.16
  5. Step 5: Solve for x
    x = 390,780.16/520.47
  6. Step 6: Final answer
    x = 750.82

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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.