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Finding the Fourth Proportional to 120.89, 166.50 and 112.39

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Solution

The fourth proportional to 120.89, 166.50 and 112.39 is: 154.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.89 : 166.50 = 112.39 : x
  2. Step 2: Convert to fraction form
    120.89/166.50 = 112.39/x
  3. Step 3: Cross multiply
    120.89x = 166.50 × 112.39
  4. Step 4: Simplify right side
    120.89x = 18,711.54
  5. Step 5: Solve for x
    x = 18,711.54/120.89
  6. Step 6: Final answer
    x = 154.78

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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.