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Finding the Fourth Proportional to 81.41, 112.33 and 49.91

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Solution

The fourth proportional to 81.41, 112.33 and 49.91 is: 68.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.41 : 112.33 = 49.91 : x
  2. Step 2: Convert to fraction form
    81.41/112.33 = 49.91/x
  3. Step 3: Cross multiply
    81.41x = 112.33 × 49.91
  4. Step 4: Simplify right side
    81.41x = 5,606.39
  5. Step 5: Solve for x
    x = 5,606.39/81.41
  6. Step 6: Final answer
    x = 68.87

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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.