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Finding the Fourth Proportional to 112.36, 168.48 and 81.94

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Solution

The fourth proportional to 112.36, 168.48 and 81.94 is: 122.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.36 : 168.48 = 81.94 : x
  2. Step 2: Convert to fraction form
    112.36/168.48 = 81.94/x
  3. Step 3: Cross multiply
    112.36x = 168.48 × 81.94
  4. Step 4: Simplify right side
    112.36x = 13,805.25
  5. Step 5: Solve for x
    x = 13,805.25/112.36
  6. Step 6: Final answer
    x = 122.87

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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.