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Finding the Fourth Proportional to 83.87, 125.57 and 81.69

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Solution

The fourth proportional to 83.87, 125.57 and 81.69 is: 122.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.87 : 125.57 = 81.69 : x
  2. Step 2: Convert to fraction form
    83.87/125.57 = 81.69/x
  3. Step 3: Cross multiply
    83.87x = 125.57 × 81.69
  4. Step 4: Simplify right side
    83.87x = 10,257.79
  5. Step 5: Solve for x
    x = 10,257.79/83.87
  6. Step 6: Final answer
    x = 122.31

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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.