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Finding the Third Proportional to 15,918 and 20,877

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Solution

The third proportional to 15,918 and 20,877 is: 27,380.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,918 : 20,877 = 20,877 : x
  2. Step 2: Convert to fraction form
    15,918/20,877 = 20,877/x
  3. Step 3: Cross multiply
    15,918x = 20,877 × 20,877
  4. Step 4: Simplify right side
    15,918x = 435,849,129
  5. Step 5: Solve for x
    x = 435,849,129/15,918
  6. Step 6: Final answer
    x = 27,380.90

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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.