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Finding the Third Proportional to 256,676 and 396,678

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Solution

The third proportional to 256,676 and 396,678 is: 613,043.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,676 : 396,678 = 396,678 : x
  2. Step 2: Convert to fraction form
    256,676/396,678 = 396,678/x
  3. Step 3: Cross multiply
    256,676x = 396,678 × 396,678
  4. Step 4: Simplify right side
    256,676x = 157,353,435,684
  5. Step 5: Solve for x
    x = 157,353,435,684/256,676
  6. Step 6: Final answer
    x = 613,043.04

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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.