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Finding the Fourth Proportional to 542.57, 813.78 and 217.94

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Solution

The fourth proportional to 542.57, 813.78 and 217.94 is: 326.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.57 : 813.78 = 217.94 : x
  2. Step 2: Convert to fraction form
    542.57/813.78 = 217.94/x
  3. Step 3: Cross multiply
    542.57x = 813.78 × 217.94
  4. Step 4: Simplify right side
    542.57x = 177,355.21
  5. Step 5: Solve for x
    x = 177,355.21/542.57
  6. Step 6: Final answer
    x = 326.88

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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.