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Finding the Fourth Proportional to 542.27, 748.40 and 393.38

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Solution

The fourth proportional to 542.27, 748.40 and 393.38 is: 542.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.27 : 748.40 = 393.38 : x
  2. Step 2: Convert to fraction form
    542.27/748.40 = 393.38/x
  3. Step 3: Cross multiply
    542.27x = 748.40 × 393.38
  4. Step 4: Simplify right side
    542.27x = 294,402.83
  5. Step 5: Solve for x
    x = 294,402.83/542.27
  6. Step 6: Final answer
    x = 542.91

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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.