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Finding the Fourth Proportional to 107.45, 161.37 and 80.31

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Solution

The fourth proportional to 107.45, 161.37 and 80.31 is: 120.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.45 : 161.37 = 80.31 : x
  2. Step 2: Convert to fraction form
    107.45/161.37 = 80.31/x
  3. Step 3: Cross multiply
    107.45x = 161.37 × 80.31
  4. Step 4: Simplify right side
    107.45x = 12,959.62
  5. Step 5: Solve for x
    x = 12,959.62/107.45
  6. Step 6: Final answer
    x = 120.62

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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.