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Finding the Third Proportional to 20,405 and 30,512

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Solution

The third proportional to 20,405 and 30,512 is: 45,625.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,405 : 30,512 = 30,512 : x
  2. Step 2: Convert to fraction form
    20,405/30,512 = 30,512/x
  3. Step 3: Cross multiply
    20,405x = 30,512 × 30,512
  4. Step 4: Simplify right side
    20,405x = 930,982,144
  5. Step 5: Solve for x
    x = 930,982,144/20,405
  6. Step 6: Final answer
    x = 45,625.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.