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Finding the Fourth Proportional to 112.56, 168.22 and 82.20

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Solution

The fourth proportional to 112.56, 168.22 and 82.20 is: 122.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.56 : 168.22 = 82.20 : x
  2. Step 2: Convert to fraction form
    112.56/168.22 = 82.20/x
  3. Step 3: Cross multiply
    112.56x = 168.22 × 82.20
  4. Step 4: Simplify right side
    112.56x = 13,827.68
  5. Step 5: Solve for x
    x = 13,827.68/112.56
  6. Step 6: Final answer
    x = 122.85

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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.