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Finding the Fourth Proportional to 626.42, 938.12 and 408.80

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Solution

The fourth proportional to 626.42, 938.12 and 408.80 is: 612.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    626.42 : 938.12 = 408.80 : x
  2. Step 2: Convert to fraction form
    626.42/938.12 = 408.80/x
  3. Step 3: Cross multiply
    626.42x = 938.12 × 408.80
  4. Step 4: Simplify right side
    626.42x = 383,503.46
  5. Step 5: Solve for x
    x = 383,503.46/626.42
  6. Step 6: Final answer
    x = 612.21

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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.