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Finding the Third Proportional to 81,869 and 115,819

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Solution

The third proportional to 81,869 and 115,819 is: 163,847.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,869 : 115,819 = 115,819 : x
  2. Step 2: Convert to fraction form
    81,869/115,819 = 115,819/x
  3. Step 3: Cross multiply
    81,869x = 115,819 × 115,819
  4. Step 4: Simplify right side
    81,869x = 13,414,040,761
  5. Step 5: Solve for x
    x = 13,414,040,761/81,869
  6. Step 6: Final answer
    x = 163,847.62

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.