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Finding the Fourth Proportional to 120.73, 166.48 and 81.85

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Solution

The fourth proportional to 120.73, 166.48 and 81.85 is: 112.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.73 : 166.48 = 81.85 : x
  2. Step 2: Convert to fraction form
    120.73/166.48 = 81.85/x
  3. Step 3: Cross multiply
    120.73x = 166.48 × 81.85
  4. Step 4: Simplify right side
    120.73x = 13,626.39
  5. Step 5: Solve for x
    x = 13,626.39/120.73
  6. Step 6: Final answer
    x = 112.87

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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.