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Finding the Fourth Proportional to 121.13, 166.92 and 77.39

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Solution

The fourth proportional to 121.13, 166.92 and 77.39 is: 106.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.13 : 166.92 = 77.39 : x
  2. Step 2: Convert to fraction form
    121.13/166.92 = 77.39/x
  3. Step 3: Cross multiply
    121.13x = 166.92 × 77.39
  4. Step 4: Simplify right side
    121.13x = 12,917.10
  5. Step 5: Solve for x
    x = 12,917.10/121.13
  6. Step 6: Final answer
    x = 106.64

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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.