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Finding the Third Proportional to 13,862 and 20,787

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Solution

The third proportional to 13,862 and 20,787 is: 31,171.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,862 : 20,787 = 20,787 : x
  2. Step 2: Convert to fraction form
    13,862/20,787 = 20,787/x
  3. Step 3: Cross multiply
    13,862x = 20,787 × 20,787
  4. Step 4: Simplify right side
    13,862x = 432,099,369
  5. Step 5: Solve for x
    x = 432,099,369/13,862
  6. Step 6: Final answer
    x = 31,171.50

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.