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Finding the Fourth Proportional to 439.87, 658.63 and 387.97

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Solution

The fourth proportional to 439.87, 658.63 and 387.97 is: 580.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.87 : 658.63 = 387.97 : x
  2. Step 2: Convert to fraction form
    439.87/658.63 = 387.97/x
  3. Step 3: Cross multiply
    439.87x = 658.63 × 387.97
  4. Step 4: Simplify right side
    439.87x = 255,528.68
  5. Step 5: Solve for x
    x = 255,528.68/439.87
  6. Step 6: Final answer
    x = 580.92

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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.