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Finding the Fourth Proportional to 129.91, 195.17 and 111.69

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Solution

The fourth proportional to 129.91, 195.17 and 111.69 is: 167.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.91 : 195.17 = 111.69 : x
  2. Step 2: Convert to fraction form
    129.91/195.17 = 111.69/x
  3. Step 3: Cross multiply
    129.91x = 195.17 × 111.69
  4. Step 4: Simplify right side
    129.91x = 21,797.88
  5. Step 5: Solve for x
    x = 21,797.88/129.91
  6. Step 6: Final answer
    x = 167.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.