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Finding the Third Proportional to 12,891 and 21,309

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Solution

The third proportional to 12,891 and 21,309 is: 35,224.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,891 : 21,309 = 21,309 : x
  2. Step 2: Convert to fraction form
    12,891/21,309 = 21,309/x
  3. Step 3: Cross multiply
    12,891x = 21,309 × 21,309
  4. Step 4: Simplify right side
    12,891x = 454,073,481
  5. Step 5: Solve for x
    x = 454,073,481/12,891
  6. Step 6: Final answer
    x = 35,224.07

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.