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Finding the Third Proportional to 15,886 and 20,890

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Solution

The third proportional to 15,886 and 20,890 is: 27,470.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,886 : 20,890 = 20,890 : x
  2. Step 2: Convert to fraction form
    15,886/20,890 = 20,890/x
  3. Step 3: Cross multiply
    15,886x = 20,890 × 20,890
  4. Step 4: Simplify right side
    15,886x = 436,392,100
  5. Step 5: Solve for x
    x = 436,392,100/15,886
  6. Step 6: Final answer
    x = 27,470.23

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.