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Finding the Third Proportional to 12,690 and 27,909

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Solution

The third proportional to 12,690 and 27,909 is: 61,380.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,690 : 27,909 = 27,909 : x
  2. Step 2: Convert to fraction form
    12,690/27,909 = 27,909/x
  3. Step 3: Cross multiply
    12,690x = 27,909 × 27,909
  4. Step 4: Simplify right side
    12,690x = 778,912,281
  5. Step 5: Solve for x
    x = 778,912,281/12,690
  6. Step 6: Final answer
    x = 61,380.01

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.