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Finding the Fourth Proportional to 112.28, 169.03 and 76.44

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Solution

The fourth proportional to 112.28, 169.03 and 76.44 is: 115.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.28 : 169.03 = 76.44 : x
  2. Step 2: Convert to fraction form
    112.28/169.03 = 76.44/x
  3. Step 3: Cross multiply
    112.28x = 169.03 × 76.44
  4. Step 4: Simplify right side
    112.28x = 12,920.65
  5. Step 5: Solve for x
    x = 12,920.65/112.28
  6. Step 6: Final answer
    x = 115.08

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.