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Finding the Fourth Proportional to 129.22, 192.68 and 126.61

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Solution

The fourth proportional to 129.22, 192.68 and 126.61 is: 188.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.22 : 192.68 = 126.61 : x
  2. Step 2: Convert to fraction form
    129.22/192.68 = 126.61/x
  3. Step 3: Cross multiply
    129.22x = 192.68 × 126.61
  4. Step 4: Simplify right side
    129.22x = 24,395.21
  5. Step 5: Solve for x
    x = 24,395.21/129.22
  6. Step 6: Final answer
    x = 188.79

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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.