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Finding the Third Proportional to 878.50 and 2,127

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Solution

The third proportional to 878.50 and 2,127 is: 5,149.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    878.50 : 2,127 = 2,127 : x
  2. Step 2: Convert to fraction form
    878.50/2,127 = 2,127/x
  3. Step 3: Cross multiply
    878.50x = 2,127 × 2,127
  4. Step 4: Simplify right side
    878.50x = 4,524,129
  5. Step 5: Solve for x
    x = 4,524,129/878.50
  6. Step 6: Final answer
    x = 5,149.83

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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.