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Finding the Third Proportional to 10,515 and 20,505

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Solution

The third proportional to 10,515 and 20,505 is: 39,986.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,515 : 20,505 = 20,505 : x
  2. Step 2: Convert to fraction form
    10,515/20,505 = 20,505/x
  3. Step 3: Cross multiply
    10,515x = 20,505 × 20,505
  4. Step 4: Simplify right side
    10,515x = 420,455,025
  5. Step 5: Solve for x
    x = 420,455,025/10,515
  6. Step 6: Final answer
    x = 39,986.21

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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.