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Finding the Fourth Proportional to 411.50, 616.64 and 381.12

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Solution

The fourth proportional to 411.50, 616.64 and 381.12 is: 571.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.50 : 616.64 = 381.12 : x
  2. Step 2: Convert to fraction form
    411.50/616.64 = 381.12/x
  3. Step 3: Cross multiply
    411.50x = 616.64 × 381.12
  4. Step 4: Simplify right side
    411.50x = 235,011.93
  5. Step 5: Solve for x
    x = 235,011.93/411.50
  6. Step 6: Final answer
    x = 571.12

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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.