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Finding the Third Proportional to 425.50 and 439.75

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Solution

The third proportional to 425.50 and 439.75 is: 454.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    425.50 : 439.75 = 439.75 : x
  2. Step 2: Convert to fraction form
    425.50/439.75 = 439.75/x
  3. Step 3: Cross multiply
    425.50x = 439.75 × 439.75
  4. Step 4: Simplify right side
    425.50x = 193,380.06
  5. Step 5: Solve for x
    x = 193,380.06/425.50
  6. Step 6: Final answer
    x = 454.48

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.