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Finding the Fourth Proportional to 112.72, 169.13 and 69.39

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Solution

The fourth proportional to 112.72, 169.13 and 69.39 is: 104.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.72 : 169.13 = 69.39 : x
  2. Step 2: Convert to fraction form
    112.72/169.13 = 69.39/x
  3. Step 3: Cross multiply
    112.72x = 169.13 × 69.39
  4. Step 4: Simplify right side
    112.72x = 11,735.93
  5. Step 5: Solve for x
    x = 11,735.93/112.72
  6. Step 6: Final answer
    x = 104.12

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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.