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Finding the Fourth Proportional to 112.71, 169.17 and 104.22

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Solution

The fourth proportional to 112.71, 169.17 and 104.22 is: 156.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.71 : 169.17 = 104.22 : x
  2. Step 2: Convert to fraction form
    112.71/169.17 = 104.22/x
  3. Step 3: Cross multiply
    112.71x = 169.17 × 104.22
  4. Step 4: Simplify right side
    112.71x = 17,630.90
  5. Step 5: Solve for x
    x = 17,630.90/112.71
  6. Step 6: Final answer
    x = 156.43

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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.