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Finding the Third Proportional to 10,628 and 20,991

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Solution

The third proportional to 10,628 and 20,991 is: 41,458.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,628 : 20,991 = 20,991 : x
  2. Step 2: Convert to fraction form
    10,628/20,991 = 20,991/x
  3. Step 3: Cross multiply
    10,628x = 20,991 × 20,991
  4. Step 4: Simplify right side
    10,628x = 440,622,081
  5. Step 5: Solve for x
    x = 440,622,081/10,628
  6. Step 6: Final answer
    x = 41,458.61

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Why These Related Problems?

These problems maintain the same ratio (1.98) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.