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Finding the Fourth Proportional to 129.62, 194.97 and 111.80

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Solution

The fourth proportional to 129.62, 194.97 and 111.80 is: 168.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.62 : 194.97 = 111.80 : x
  2. Step 2: Convert to fraction form
    129.62/194.97 = 111.80/x
  3. Step 3: Cross multiply
    129.62x = 194.97 × 111.80
  4. Step 4: Simplify right side
    129.62x = 21,797.65
  5. Step 5: Solve for x
    x = 21,797.65/129.62
  6. Step 6: Final answer
    x = 168.17

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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.