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Finding the Fourth Proportional to 542.72, 748.16 and 387.20

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Solution

The fourth proportional to 542.72, 748.16 and 387.20 is: 533.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    542.72 : 748.16 = 387.20 : x
  2. Step 2: Convert to fraction form
    542.72/748.16 = 387.20/x
  3. Step 3: Cross multiply
    542.72x = 748.16 × 387.20
  4. Step 4: Simplify right side
    542.72x = 289,681.88
  5. Step 5: Solve for x
    x = 289,681.88/542.72
  6. Step 6: Final answer
    x = 533.76

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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.