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Finding the Third Proportional to 396.50 and 878

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Solution

The third proportional to 396.50 and 878 is: 1,944.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    396.50 : 878 = 878 : x
  2. Step 2: Convert to fraction form
    396.50/878 = 878/x
  3. Step 3: Cross multiply
    396.50x = 878 × 878
  4. Step 4: Simplify right side
    396.50x = 770,884
  5. Step 5: Solve for x
    x = 770,884/396.50
  6. Step 6: Final answer
    x = 1,944.22

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Why These Related Problems?

These problems maintain the same ratio (2.21) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.