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Finding the Fourth Proportional to 411.78, 616.32 and 381.90

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Solution

The fourth proportional to 411.78, 616.32 and 381.90 is: 571.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.78 : 616.32 = 381.90 : x
  2. Step 2: Convert to fraction form
    411.78/616.32 = 381.90/x
  3. Step 3: Cross multiply
    411.78x = 616.32 × 381.90
  4. Step 4: Simplify right side
    411.78x = 235,372.61
  5. Step 5: Solve for x
    x = 235,372.61/411.78
  6. Step 6: Final answer
    x = 571.60

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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.