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Finding the Fourth Proportional to 129.14, 178.60 and 115.30

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Solution

The fourth proportional to 129.14, 178.60 and 115.30 is: 159.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.14 : 178.60 = 115.30 : x
  2. Step 2: Convert to fraction form
    129.14/178.60 = 115.30/x
  3. Step 3: Cross multiply
    129.14x = 178.60 × 115.30
  4. Step 4: Simplify right side
    129.14x = 20,591.85
  5. Step 5: Solve for x
    x = 20,591.85/129.14
  6. Step 6: Final answer
    x = 159.46

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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.