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Finding the Fourth Proportional to 658.20, 987.12 and 225.12

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Solution

The fourth proportional to 658.20, 987.12 and 225.12 is: 337.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.20 : 987.12 = 225.12 : x
  2. Step 2: Convert to fraction form
    658.20/987.12 = 225.12/x
  3. Step 3: Cross multiply
    658.20x = 987.12 × 225.12
  4. Step 4: Simplify right side
    658.20x = 222,220.45
  5. Step 5: Solve for x
    x = 222,220.45/658.20
  6. Step 6: Final answer
    x = 337.62

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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.