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Finding the Fourth Proportional to 658.40, 987.66 and 225.59

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Solution

The fourth proportional to 658.40, 987.66 and 225.59 is: 338.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.40 : 987.66 = 225.59 : x
  2. Step 2: Convert to fraction form
    658.40/987.66 = 225.59/x
  3. Step 3: Cross multiply
    658.40x = 987.66 × 225.59
  4. Step 4: Simplify right side
    658.40x = 222,801.28
  5. Step 5: Solve for x
    x = 222,801.28/658.40
  6. Step 6: Final answer
    x = 338.40

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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.