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Finding the Fourth Proportional to 112.42, 154.96 and 81.29

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Solution

The fourth proportional to 112.42, 154.96 and 81.29 is: 112.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.42 : 154.96 = 81.29 : x
  2. Step 2: Convert to fraction form
    112.42/154.96 = 81.29/x
  3. Step 3: Cross multiply
    112.42x = 154.96 × 81.29
  4. Step 4: Simplify right side
    112.42x = 12,595.52
  5. Step 5: Solve for x
    x = 12,595.52/112.42
  6. Step 6: Final answer
    x = 112.04

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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.