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Finding the Fourth Proportional to 149.20, 223.88 and 80.68

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Solution

The fourth proportional to 149.20, 223.88 and 80.68 is: 121.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.20 : 223.88 = 80.68 : x
  2. Step 2: Convert to fraction form
    149.20/223.88 = 80.68/x
  3. Step 3: Cross multiply
    149.20x = 223.88 × 80.68
  4. Step 4: Simplify right side
    149.20x = 18,062.64
  5. Step 5: Solve for x
    x = 18,062.64/149.20
  6. Step 6: Final answer
    x = 121.06

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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.