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Finding the Third Proportional to 878 and 2,187

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Solution

The third proportional to 878 and 2,187 is: 5,447.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    878 : 2,187 = 2,187 : x
  2. Step 2: Convert to fraction form
    878/2,187 = 2,187/x
  3. Step 3: Cross multiply
    878x = 2,187 × 2,187
  4. Step 4: Simplify right side
    878x = 4,782,969
  5. Step 5: Solve for x
    x = 4,782,969/878
  6. Step 6: Final answer
    x = 5,447.57

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Why These Related Problems?

These problems maintain the same ratio (2.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.