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Finding the Fourth Proportional to 658.48, 987.78 and 225.64

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Solution

The fourth proportional to 658.48, 987.78 and 225.64 is: 338.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.48 : 987.78 = 225.64 : x
  2. Step 2: Convert to fraction form
    658.48/987.78 = 225.64/x
  3. Step 3: Cross multiply
    658.48x = 987.78 × 225.64
  4. Step 4: Simplify right side
    658.48x = 222,882.68
  5. Step 5: Solve for x
    x = 222,882.68/658.48
  6. Step 6: Final answer
    x = 338.48

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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.