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Finding the Fourth Proportional to 129.26, 193.87 and 43.78

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Solution

The fourth proportional to 129.26, 193.87 and 43.78 is: 65.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.26 : 193.87 = 43.78 : x
  2. Step 2: Convert to fraction form
    129.26/193.87 = 43.78/x
  3. Step 3: Cross multiply
    129.26x = 193.87 × 43.78
  4. Step 4: Simplify right side
    129.26x = 8,487.63
  5. Step 5: Solve for x
    x = 8,487.63/129.26
  6. Step 6: Final answer
    x = 65.66

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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.