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Finding the Fourth Proportional to 112.38, 154.94 and 81.33

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Solution

The fourth proportional to 112.38, 154.94 and 81.33 is: 112.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    112.38 : 154.94 = 81.33 : x
  2. Step 2: Convert to fraction form
    112.38/154.94 = 81.33/x
  3. Step 3: Cross multiply
    112.38x = 154.94 × 81.33
  4. Step 4: Simplify right side
    112.38x = 12,600.86
  5. Step 5: Solve for x
    x = 12,600.86/112.38
  6. Step 6: Final answer
    x = 112.13

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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.