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Finding the Fourth Proportional to 76.44, 113.97 and 75.64

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Solution

The fourth proportional to 76.44, 113.97 and 75.64 is: 112.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.44 : 113.97 = 75.64 : x
  2. Step 2: Convert to fraction form
    76.44/113.97 = 75.64/x
  3. Step 3: Cross multiply
    76.44x = 113.97 × 75.64
  4. Step 4: Simplify right side
    76.44x = 8,620.69
  5. Step 5: Solve for x
    x = 8,620.69/76.44
  6. Step 6: Final answer
    x = 112.78

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.