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Finding the Third Proportional to 20,976 and 40,889

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Solution

The third proportional to 20,976 and 40,889 is: 79,705.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,976 : 40,889 = 40,889 : x
  2. Step 2: Convert to fraction form
    20,976/40,889 = 40,889/x
  3. Step 3: Cross multiply
    20,976x = 40,889 × 40,889
  4. Step 4: Simplify right side
    20,976x = 1,671,910,321
  5. Step 5: Solve for x
    x = 1,671,910,321/20,976
  6. Step 6: Final answer
    x = 79,705.87

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Why These Related Problems?

These problems maintain the same ratio (1.95) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.