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Finding the Fourth Proportional to 121.14, 166.80 and 115.92

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Solution

The fourth proportional to 121.14, 166.80 and 115.92 is: 159.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.14 : 166.80 = 115.92 : x
  2. Step 2: Convert to fraction form
    121.14/166.80 = 115.92/x
  3. Step 3: Cross multiply
    121.14x = 166.80 × 115.92
  4. Step 4: Simplify right side
    121.14x = 19,335.46
  5. Step 5: Solve for x
    x = 19,335.46/121.14
  6. Step 6: Final answer
    x = 159.61

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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.