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Finding the Fourth Proportional to 411.43, 616.99 and 216.57

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Solution

The fourth proportional to 411.43, 616.99 and 216.57 is: 324.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.43 : 616.99 = 216.57 : x
  2. Step 2: Convert to fraction form
    411.43/616.99 = 216.57/x
  3. Step 3: Cross multiply
    411.43x = 616.99 × 216.57
  4. Step 4: Simplify right side
    411.43x = 133,624.31
  5. Step 5: Solve for x
    x = 133,624.31/411.43
  6. Step 6: Final answer
    x = 324.78

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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.