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Finding the Fourth Proportional to 81.85, 112.95 and 49.12

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Solution

The fourth proportional to 81.85, 112.95 and 49.12 is: 67.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.85 : 112.95 = 49.12 : x
  2. Step 2: Convert to fraction form
    81.85/112.95 = 49.12/x
  3. Step 3: Cross multiply
    81.85x = 112.95 × 49.12
  4. Step 4: Simplify right side
    81.85x = 5,548.10
  5. Step 5: Solve for x
    x = 5,548.10/81.85
  6. Step 6: Final answer
    x = 67.78

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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.