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Finding the Third Proportional to 439.50 and 679.25

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Solution

The third proportional to 439.50 and 679.25 is: 1,049.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.50 : 679.25 = 679.25 : x
  2. Step 2: Convert to fraction form
    439.50/679.25 = 679.25/x
  3. Step 3: Cross multiply
    439.50x = 679.25 × 679.25
  4. Step 4: Simplify right side
    439.50x = 461,380.56
  5. Step 5: Solve for x
    x = 461,380.56/439.50
  6. Step 6: Final answer
    x = 1,049.79

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.