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Finding the Fourth Proportional to 112.38, 168.22 and 86.80

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Solution

The fourth proportional to 112.38, 168.22 and 86.80 is: 129.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.38 : 168.22 = 86.80 : x
  2. Step 2: Convert to fraction form
    112.38/168.22 = 86.80/x
  3. Step 3: Cross multiply
    112.38x = 168.22 × 86.80
  4. Step 4: Simplify right side
    112.38x = 14,601.50
  5. Step 5: Solve for x
    x = 14,601.50/112.38
  6. Step 6: Final answer
    x = 129.93

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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.