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Finding the Fourth Proportional to 129.85, 178.66 and 125.36

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Solution

The fourth proportional to 129.85, 178.66 and 125.36 is: 172.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.85 : 178.66 = 125.36 : x
  2. Step 2: Convert to fraction form
    129.85/178.66 = 125.36/x
  3. Step 3: Cross multiply
    129.85x = 178.66 × 125.36
  4. Step 4: Simplify right side
    129.85x = 22,395.61
  5. Step 5: Solve for x
    x = 22,395.61/129.85
  6. Step 6: Final answer
    x = 172.48

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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.