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Finding the Fourth Proportional to 625.87, 938.85 and 408.79

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Solution

The fourth proportional to 625.87, 938.85 and 408.79 is: 613.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    625.87 : 938.85 = 408.79 : x
  2. Step 2: Convert to fraction form
    625.87/938.85 = 408.79/x
  3. Step 3: Cross multiply
    625.87x = 938.85 × 408.79
  4. Step 4: Simplify right side
    625.87x = 383,792.49
  5. Step 5: Solve for x
    x = 383,792.49/625.87
  6. Step 6: Final answer
    x = 613.21

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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.