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Finding the Fourth Proportional to 83.85, 125.84 and 29.78

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Solution

The fourth proportional to 83.85, 125.84 and 29.78 is: 44.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.85 : 125.84 = 29.78 : x
  2. Step 2: Convert to fraction form
    83.85/125.84 = 29.78/x
  3. Step 3: Cross multiply
    83.85x = 125.84 × 29.78
  4. Step 4: Simplify right side
    83.85x = 3,747.90
  5. Step 5: Solve for x
    x = 3,747.90/83.85
  6. Step 6: Final answer
    x = 44.70

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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.