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Finding the Fourth Proportional to 121.12, 166.28 and 115.86

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Solution

The fourth proportional to 121.12, 166.28 and 115.86 is: 159.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.12 : 166.28 = 115.86 : x
  2. Step 2: Convert to fraction form
    121.12/166.28 = 115.86/x
  3. Step 3: Cross multiply
    121.12x = 166.28 × 115.86
  4. Step 4: Simplify right side
    121.12x = 19,265.20
  5. Step 5: Solve for x
    x = 19,265.20/121.12
  6. Step 6: Final answer
    x = 159.06

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.