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Finding the Third Proportional to 9,991 and 21,625

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Solution

The third proportional to 9,991 and 21,625 is: 46,806.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,991 : 21,625 = 21,625 : x
  2. Step 2: Convert to fraction form
    9,991/21,625 = 21,625/x
  3. Step 3: Cross multiply
    9,991x = 21,625 × 21,625
  4. Step 4: Simplify right side
    9,991x = 467,640,625
  5. Step 5: Solve for x
    x = 467,640,625/9,991
  6. Step 6: Final answer
    x = 46,806.19

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.