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Finding the Fourth Proportional to 76.92, 115.44 and 40.86

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Solution

The fourth proportional to 76.92, 115.44 and 40.86 is: 61.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.92 : 115.44 = 40.86 : x
  2. Step 2: Convert to fraction form
    76.92/115.44 = 40.86/x
  3. Step 3: Cross multiply
    76.92x = 115.44 × 40.86
  4. Step 4: Simplify right side
    76.92x = 4,716.88
  5. Step 5: Solve for x
    x = 4,716.88/76.92
  6. Step 6: Final answer
    x = 61.32

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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.