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Finding the Fourth Proportional to 542.69, 813.38 and 249.78

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Solution

The fourth proportional to 542.69, 813.38 and 249.78 is: 374.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.69 : 813.38 = 249.78 : x
  2. Step 2: Convert to fraction form
    542.69/813.38 = 249.78/x
  3. Step 3: Cross multiply
    542.69x = 813.38 × 249.78
  4. Step 4: Simplify right side
    542.69x = 203,162.97
  5. Step 5: Solve for x
    x = 203,162.97/542.69
  6. Step 6: Final answer
    x = 374.36

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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.