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Finding the Fourth Proportional to 112.27, 154.96 and 81.28

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Solution

The fourth proportional to 112.27, 154.96 and 81.28 is: 112.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.27 : 154.96 = 81.28 : x
  2. Step 2: Convert to fraction form
    112.27/154.96 = 81.28/x
  3. Step 3: Cross multiply
    112.27x = 154.96 × 81.28
  4. Step 4: Simplify right side
    112.27x = 12,595.15
  5. Step 5: Solve for x
    x = 12,595.15/112.27
  6. Step 6: Final answer
    x = 112.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.