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Finding the Fourth Proportional to 129.12, 194.55 and 106.79

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Solution

The fourth proportional to 129.12, 194.55 and 106.79 is: 160.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.12 : 194.55 = 106.79 : x
  2. Step 2: Convert to fraction form
    129.12/194.55 = 106.79/x
  3. Step 3: Cross multiply
    129.12x = 194.55 × 106.79
  4. Step 4: Simplify right side
    129.12x = 20,776.48
  5. Step 5: Solve for x
    x = 20,776.48/129.12
  6. Step 6: Final answer
    x = 160.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.