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Finding the Fourth Proportional to 107.65, 161.32 and 80.58

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Solution

The fourth proportional to 107.65, 161.32 and 80.58 is: 120.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.65 : 161.32 = 80.58 : x
  2. Step 2: Convert to fraction form
    107.65/161.32 = 80.58/x
  3. Step 3: Cross multiply
    107.65x = 161.32 × 80.58
  4. Step 4: Simplify right side
    107.65x = 12,997.96
  5. Step 5: Solve for x
    x = 12,997.96/107.65
  6. Step 6: Final answer
    x = 120.75

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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.