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Finding the Fourth Proportional to 658.80, 988.31 and 225.86

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Solution

The fourth proportional to 658.80, 988.31 and 225.86 is: 338.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.80 : 988.31 = 225.86 : x
  2. Step 2: Convert to fraction form
    658.80/988.31 = 225.86/x
  3. Step 3: Cross multiply
    658.80x = 988.31 × 225.86
  4. Step 4: Simplify right side
    658.80x = 223,215.32
  5. Step 5: Solve for x
    x = 223,215.32/658.80
  6. Step 6: Final answer
    x = 338.82

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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.