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Finding the Third Proportional to 21,879 and 40,704.75

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Solution

The third proportional to 21,879 and 40,704.75 is: 75,729.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,879 : 40,704.75 = 40,704.75 : x
  2. Step 2: Convert to fraction form
    21,879/40,704.75 = 40,704.75/x
  3. Step 3: Cross multiply
    21,879x = 40,704.75 × 40,704.75
  4. Step 4: Simplify right side
    21,879x = 1,656,876,672.56
  5. Step 5: Solve for x
    x = 1,656,876,672.56/21,879
  6. Step 6: Final answer
    x = 75,729.09

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.