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Finding the Fourth Proportional to 542.31, 748.80 and 417.78

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Solution

The fourth proportional to 542.31, 748.80 and 417.78 is: 576.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.31 : 748.80 = 417.78 : x
  2. Step 2: Convert to fraction form
    542.31/748.80 = 417.78/x
  3. Step 3: Cross multiply
    542.31x = 748.80 × 417.78
  4. Step 4: Simplify right side
    542.31x = 312,833.66
  5. Step 5: Solve for x
    x = 312,833.66/542.31
  6. Step 6: Final answer
    x = 576.85

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.