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Finding the Fourth Proportional to 112.25, 168.21 and 81.74

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Solution

The fourth proportional to 112.25, 168.21 and 81.74 is: 122.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.25 : 168.21 = 81.74 : x
  2. Step 2: Convert to fraction form
    112.25/168.21 = 81.74/x
  3. Step 3: Cross multiply
    112.25x = 168.21 × 81.74
  4. Step 4: Simplify right side
    112.25x = 13,749.91
  5. Step 5: Solve for x
    x = 13,749.91/112.25
  6. Step 6: Final answer
    x = 122.49

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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.