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Finding the Fourth Proportional to 658.72, 987.76 and 521.44

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Solution

The fourth proportional to 658.72, 987.76 and 521.44 is: 781.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.72 : 987.76 = 521.44 : x
  2. Step 2: Convert to fraction form
    658.72/987.76 = 521.44/x
  3. Step 3: Cross multiply
    658.72x = 987.76 × 521.44
  4. Step 4: Simplify right side
    658.72x = 515,057.57
  5. Step 5: Solve for x
    x = 515,057.57/658.72
  6. Step 6: Final answer
    x = 781.91

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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.