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Finding the Fourth Proportional to 76.97, 115.42 and 33.61

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Solution

The fourth proportional to 76.97, 115.42 and 33.61 is: 50.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.97 : 115.42 = 33.61 : x
  2. Step 2: Convert to fraction form
    76.97/115.42 = 33.61/x
  3. Step 3: Cross multiply
    76.97x = 115.42 × 33.61
  4. Step 4: Simplify right side
    76.97x = 3,879.10
  5. Step 5: Solve for x
    x = 3,879.10/76.97
  6. Step 6: Final answer
    x = 50.40

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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.