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Finding the Fourth Proportional to 520.72, 781.89 and 497.64

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Solution

The fourth proportional to 520.72, 781.89 and 497.64 is: 747.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.72 : 781.89 = 497.64 : x
  2. Step 2: Convert to fraction form
    520.72/781.89 = 497.64/x
  3. Step 3: Cross multiply
    520.72x = 781.89 × 497.64
  4. Step 4: Simplify right side
    520.72x = 389,099.74
  5. Step 5: Solve for x
    x = 389,099.74/520.72
  6. Step 6: Final answer
    x = 747.23

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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.