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Finding the Third Proportional to 13,690 and 19,907

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Solution

The third proportional to 13,690 and 19,907 is: 28,947.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,690 : 19,907 = 19,907 : x
  2. Step 2: Convert to fraction form
    13,690/19,907 = 19,907/x
  3. Step 3: Cross multiply
    13,690x = 19,907 × 19,907
  4. Step 4: Simplify right side
    13,690x = 396,288,649
  5. Step 5: Solve for x
    x = 396,288,649/13,690
  6. Step 6: Final answer
    x = 28,947.31

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.