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Finding the Fourth Proportional to 217.92, 326.85 and 205.87

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Solution

The fourth proportional to 217.92, 326.85 and 205.87 is: 308.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.92 : 326.85 = 205.87 : x
  2. Step 2: Convert to fraction form
    217.92/326.85 = 205.87/x
  3. Step 3: Cross multiply
    217.92x = 326.85 × 205.87
  4. Step 4: Simplify right side
    217.92x = 67,288.61
  5. Step 5: Solve for x
    x = 67,288.61/217.92
  6. Step 6: Final answer
    x = 308.78

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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.