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Finding the Fourth Proportional to 129.11, 192.76 and 108.61

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Solution

The fourth proportional to 129.11, 192.76 and 108.61 is: 162.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.11 : 192.76 = 108.61 : x
  2. Step 2: Convert to fraction form
    129.11/192.76 = 108.61/x
  3. Step 3: Cross multiply
    129.11x = 192.76 × 108.61
  4. Step 4: Simplify right side
    129.11x = 20,934.91
  5. Step 5: Solve for x
    x = 20,934.91/129.11
  6. Step 6: Final answer
    x = 162.14

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.