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Finding the Fourth Proportional to 67.32, 100.85 and 54.42

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Solution

The fourth proportional to 67.32, 100.85 and 54.42 is: 81.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.32 : 100.85 = 54.42 : x
  2. Step 2: Convert to fraction form
    67.32/100.85 = 54.42/x
  3. Step 3: Cross multiply
    67.32x = 100.85 × 54.42
  4. Step 4: Simplify right side
    67.32x = 5,487.61
  5. Step 5: Solve for x
    x = 5,487.61/67.32
  6. Step 6: Final answer
    x = 81.52

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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.