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Finding the Fourth Proportional to 149.09, 223.90 and 80.75

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Solution

The fourth proportional to 149.09, 223.90 and 80.75 is: 121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    149.09 : 223.90 = 80.75 : x
  2. Step 2: Convert to fraction form
    149.09/223.90 = 80.75/x
  3. Step 3: Cross multiply
    149.09x = 223.90 × 80.75
  4. Step 4: Simplify right side
    149.09x = 18,079.93
  5. Step 5: Solve for x
    x = 18,079.93/149.09
  6. Step 6: Final answer
    x = 121.27

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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.