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Finding the Fourth Proportional to 107.67, 161.36 and 81.91

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Solution

The fourth proportional to 107.67, 161.36 and 81.91 is: 122.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.67 : 161.36 = 81.91 : x
  2. Step 2: Convert to fraction form
    107.67/161.36 = 81.91/x
  3. Step 3: Cross multiply
    107.67x = 161.36 × 81.91
  4. Step 4: Simplify right side
    107.67x = 13,217.10
  5. Step 5: Solve for x
    x = 13,217.10/107.67
  6. Step 6: Final answer
    x = 122.76

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.