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Finding the Fourth Proportional to 67.20, 100.72 and 44.39

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Solution

The fourth proportional to 67.20, 100.72 and 44.39 is: 66.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.20 : 100.72 = 44.39 : x
  2. Step 2: Convert to fraction form
    67.20/100.72 = 44.39/x
  3. Step 3: Cross multiply
    67.20x = 100.72 × 44.39
  4. Step 4: Simplify right side
    67.20x = 4,470.46
  5. Step 5: Solve for x
    x = 4,470.46/67.20
  6. Step 6: Final answer
    x = 66.53

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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.