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Finding the Fourth Proportional to 129.20, 178.16 and 126.22

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Solution

The fourth proportional to 129.20, 178.16 and 126.22 is: 174.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.20 : 178.16 = 126.22 : x
  2. Step 2: Convert to fraction form
    129.20/178.16 = 126.22/x
  3. Step 3: Cross multiply
    129.20x = 178.16 × 126.22
  4. Step 4: Simplify right side
    129.20x = 22,487.36
  5. Step 5: Solve for x
    x = 22,487.36/129.20
  6. Step 6: Final answer
    x = 174.05

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.