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Finding the Fourth Proportional to 107.66, 161.39 and 80.61

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Solution

The fourth proportional to 107.66, 161.39 and 80.61 is: 120.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.66 : 161.39 = 80.61 : x
  2. Step 2: Convert to fraction form
    107.66/161.39 = 80.61/x
  3. Step 3: Cross multiply
    107.66x = 161.39 × 80.61
  4. Step 4: Simplify right side
    107.66x = 13,009.85
  5. Step 5: Solve for x
    x = 13,009.85/107.66
  6. Step 6: Final answer
    x = 120.85

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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.