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Finding the Third Proportional to 12,390 and 16,809

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Solution

The third proportional to 12,390 and 16,809 is: 22,804.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,390 : 16,809 = 16,809 : x
  2. Step 2: Convert to fraction form
    12,390/16,809 = 16,809/x
  3. Step 3: Cross multiply
    12,390x = 16,809 × 16,809
  4. Step 4: Simplify right side
    12,390x = 282,542,481
  5. Step 5: Solve for x
    x = 282,542,481/12,390
  6. Step 6: Final answer
    x = 22,804.07

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.