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Finding the Fourth Proportional to 658.53, 987.84 and 440.55

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Solution

The fourth proportional to 658.53, 987.84 and 440.55 is: 660.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.53 : 987.84 = 440.55 : x
  2. Step 2: Convert to fraction form
    658.53/987.84 = 440.55/x
  3. Step 3: Cross multiply
    658.53x = 987.84 × 440.55
  4. Step 4: Simplify right side
    658.53x = 435,192.91
  5. Step 5: Solve for x
    x = 435,192.91/658.53
  6. Step 6: Final answer
    x = 660.86

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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.