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Finding the Third Proportional to 878 and 2,126

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Solution

The third proportional to 878 and 2,126 is: 5,147.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    878 : 2,126 = 2,126 : x
  2. Step 2: Convert to fraction form
    878/2,126 = 2,126/x
  3. Step 3: Cross multiply
    878x = 2,126 × 2,126
  4. Step 4: Simplify right side
    878x = 4,519,876
  5. Step 5: Solve for x
    x = 4,519,876/878
  6. Step 6: Final answer
    x = 5,147.92

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Why These Related Problems?

These problems maintain the same ratio (2.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.