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Finding the Fourth Proportional to 115.28, 173.09 and 112.78

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Solution

The fourth proportional to 115.28, 173.09 and 112.78 is: 169.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    115.28 : 173.09 = 112.78 : x
  2. Step 2: Convert to fraction form
    115.28/173.09 = 112.78/x
  3. Step 3: Cross multiply
    115.28x = 173.09 × 112.78
  4. Step 4: Simplify right side
    115.28x = 19,520.53
  5. Step 5: Solve for x
    x = 19,520.53/115.28
  6. Step 6: Final answer
    x = 169.33

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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.