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Finding the Fourth Proportional to 112.92, 168.57 and 109.11

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Solution

The fourth proportional to 112.92, 168.57 and 109.11 is: 162.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.92 : 168.57 = 109.11 : x
  2. Step 2: Convert to fraction form
    112.92/168.57 = 109.11/x
  3. Step 3: Cross multiply
    112.92x = 168.57 × 109.11
  4. Step 4: Simplify right side
    112.92x = 18,392.67
  5. Step 5: Solve for x
    x = 18,392.67/112.92
  6. Step 6: Final answer
    x = 162.88

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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.