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Finding the Third Proportional to 379.50 and 396.75

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Solution

The third proportional to 379.50 and 396.75 is: 414.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.50 : 396.75 = 396.75 : x
  2. Step 2: Convert to fraction form
    379.50/396.75 = 396.75/x
  3. Step 3: Cross multiply
    379.50x = 396.75 × 396.75
  4. Step 4: Simplify right side
    379.50x = 157,410.56
  5. Step 5: Solve for x
    x = 157,410.56/379.50
  6. Step 6: Final answer
    x = 414.78

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Why These Related Problems?

These problems maintain the same ratio (1.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.