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Finding the Third Proportional to 20,981 and 43,015

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Solution

The third proportional to 20,981 and 43,015 is: 88,188.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,981 : 43,015 = 43,015 : x
  2. Step 2: Convert to fraction form
    20,981/43,015 = 43,015/x
  3. Step 3: Cross multiply
    20,981x = 43,015 × 43,015
  4. Step 4: Simplify right side
    20,981x = 1,850,290,225
  5. Step 5: Solve for x
    x = 1,850,290,225/20,981
  6. Step 6: Final answer
    x = 88,188.85

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.