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Finding the Fourth Proportional to 121.91, 168.21 and 68.73

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Solution

The fourth proportional to 121.91, 168.21 and 68.73 is: 94.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.91 : 168.21 = 68.73 : x
  2. Step 2: Convert to fraction form
    121.91/168.21 = 68.73/x
  3. Step 3: Cross multiply
    121.91x = 168.21 × 68.73
  4. Step 4: Simplify right side
    121.91x = 11,560.70
  5. Step 5: Solve for x
    x = 11,560.70/121.91
  6. Step 6: Final answer
    x = 94.83

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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.