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Finding the Fourth Proportional to 80.97, 121.47 and 67.47

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Solution

The fourth proportional to 80.97, 121.47 and 67.47 is: 101.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.97 : 121.47 = 67.47 : x
  2. Step 2: Convert to fraction form
    80.97/121.47 = 67.47/x
  3. Step 3: Cross multiply
    80.97x = 121.47 × 67.47
  4. Step 4: Simplify right side
    80.97x = 8,195.58
  5. Step 5: Solve for x
    x = 8,195.58/80.97
  6. Step 6: Final answer
    x = 101.22

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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.