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Finding the Fourth Proportional to 658.52, 985.70 and 438.72

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Solution

The fourth proportional to 658.52, 985.70 and 438.72 is: 656.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    658.52 : 985.70 = 438.72 : x
  2. Step 2: Convert to fraction form
    658.52/985.70 = 438.72/x
  3. Step 3: Cross multiply
    658.52x = 985.70 × 438.72
  4. Step 4: Simplify right side
    658.52x = 432,446.30
  5. Step 5: Solve for x
    x = 432,446.30/658.52
  6. Step 6: Final answer
    x = 656.69

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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.