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Finding the Third Proportional to 20,490.75 and 31,331.25

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Solution

The third proportional to 20,490.75 and 31,331.25 is: 47,906.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,490.75 : 31,331.25 = 31,331.25 : x
  2. Step 2: Convert to fraction form
    20,490.75/31,331.25 = 31,331.25/x
  3. Step 3: Cross multiply
    20,490.75x = 31,331.25 × 31,331.25
  4. Step 4: Simplify right side
    20,490.75x = 981,647,226.56
  5. Step 5: Solve for x
    x = 981,647,226.56/20,490.75
  6. Step 6: Final answer
    x = 47,906.85

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.