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Finding the Third Proportional to 15,540 and 20,886

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Solution

The third proportional to 15,540 and 20,886 is: 28,071.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,540 : 20,886 = 20,886 : x
  2. Step 2: Convert to fraction form
    15,540/20,886 = 20,886/x
  3. Step 3: Cross multiply
    15,540x = 20,886 × 20,886
  4. Step 4: Simplify right side
    15,540x = 436,224,996
  5. Step 5: Solve for x
    x = 436,224,996/15,540
  6. Step 6: Final answer
    x = 28,071.11

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.