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Finding the Fourth Proportional to 129.75, 179.02 and 115.87

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Solution

The fourth proportional to 129.75, 179.02 and 115.87 is: 159.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.75 : 179.02 = 115.87 : x
  2. Step 2: Convert to fraction form
    129.75/179.02 = 115.87/x
  3. Step 3: Cross multiply
    129.75x = 179.02 × 115.87
  4. Step 4: Simplify right side
    129.75x = 20,743.05
  5. Step 5: Solve for x
    x = 20,743.05/129.75
  6. Step 6: Final answer
    x = 159.87

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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.