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Finding the Fourth Proportional to 129.89, 194.78 and 95.87

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Solution

The fourth proportional to 129.89, 194.78 and 95.87 is: 143.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.89 : 194.78 = 95.87 : x
  2. Step 2: Convert to fraction form
    129.89/194.78 = 95.87/x
  3. Step 3: Cross multiply
    129.89x = 194.78 × 95.87
  4. Step 4: Simplify right side
    129.89x = 18,672.92
  5. Step 5: Solve for x
    x = 18,672.92/129.89
  6. Step 6: Final answer
    x = 143.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.