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Finding the Third Proportional to 15,943 and 20,215

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Solution

The third proportional to 15,943 and 20,215 is: 25,631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,943 : 20,215 = 20,215 : x
  2. Step 2: Convert to fraction form
    15,943/20,215 = 20,215/x
  3. Step 3: Cross multiply
    15,943x = 20,215 × 20,215
  4. Step 4: Simplify right side
    15,943x = 408,646,225
  5. Step 5: Solve for x
    x = 408,646,225/15,943
  6. Step 6: Final answer
    x = 25,631.70

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Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.