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Finding the Fourth Proportional to 129.88, 194.82 and 75.88

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Solution

The fourth proportional to 129.88, 194.82 and 75.88 is: 113.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.88 : 194.82 = 75.88 : x
  2. Step 2: Convert to fraction form
    129.88/194.82 = 75.88/x
  3. Step 3: Cross multiply
    129.88x = 194.82 × 75.88
  4. Step 4: Simplify right side
    129.88x = 14,782.94
  5. Step 5: Solve for x
    x = 14,782.94/129.88
  6. Step 6: Final answer
    x = 113.82

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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.