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Finding the Fourth Proportional to 481.20, 663.30 and 393.72

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Solution

The fourth proportional to 481.20, 663.30 and 393.72 is: 542.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.20 : 663.30 = 393.72 : x
  2. Step 2: Convert to fraction form
    481.20/663.30 = 393.72/x
  3. Step 3: Cross multiply
    481.20x = 663.30 × 393.72
  4. Step 4: Simplify right side
    481.20x = 261,154.48
  5. Step 5: Solve for x
    x = 261,154.48/481.20
  6. Step 6: Final answer
    x = 542.72

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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.