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Finding the Fourth Proportional to 542.61, 813.92 and 381.02

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Solution

The fourth proportional to 542.61, 813.92 and 381.02 is: 571.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.61 : 813.92 = 381.02 : x
  2. Step 2: Convert to fraction form
    542.61/813.92 = 381.02/x
  3. Step 3: Cross multiply
    542.61x = 813.92 × 381.02
  4. Step 4: Simplify right side
    542.61x = 310,115.77
  5. Step 5: Solve for x
    x = 310,115.77/542.61
  6. Step 6: Final answer
    x = 571.52

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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.