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Finding the Fourth Proportional to 658.40, 987.56 and 225.58

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Solution

The fourth proportional to 658.40, 987.56 and 225.58 is: 338.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.40 : 987.56 = 225.58 : x
  2. Step 2: Convert to fraction form
    658.40/987.56 = 225.58/x
  3. Step 3: Cross multiply
    658.40x = 987.56 × 225.58
  4. Step 4: Simplify right side
    658.40x = 222,773.78
  5. Step 5: Solve for x
    x = 222,773.78/658.40
  6. Step 6: Final answer
    x = 338.36

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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.