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Finding the Fourth Proportional to 83.86, 125.87 and 76.68

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Solution

The fourth proportional to 83.86, 125.87 and 76.68 is: 115.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.86 : 125.87 = 76.68 : x
  2. Step 2: Convert to fraction form
    83.86/125.87 = 76.68/x
  3. Step 3: Cross multiply
    83.86x = 125.87 × 76.68
  4. Step 4: Simplify right side
    83.86x = 9,651.33
  5. Step 5: Solve for x
    x = 9,651.33/83.86
  6. Step 6: Final answer
    x = 115.09

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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.