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Finding the Fourth Proportional to 129.34, 178.28 and 125.92

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Solution

The fourth proportional to 129.34, 178.28 and 125.92 is: 173.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.34 : 178.28 = 125.92 : x
  2. Step 2: Convert to fraction form
    129.34/178.28 = 125.92/x
  3. Step 3: Cross multiply
    129.34x = 178.28 × 125.92
  4. Step 4: Simplify right side
    129.34x = 22,448.39
  5. Step 5: Solve for x
    x = 22,448.39/129.34
  6. Step 6: Final answer
    x = 173.56

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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.