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Finding the Third Proportional to 13,812 and 21,879

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Solution

The third proportional to 13,812 and 21,879 is: 34,657.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,812 : 21,879 = 21,879 : x
  2. Step 2: Convert to fraction form
    13,812/21,879 = 21,879/x
  3. Step 3: Cross multiply
    13,812x = 21,879 × 21,879
  4. Step 4: Simplify right side
    13,812x = 478,690,641
  5. Step 5: Solve for x
    x = 478,690,641/13,812
  6. Step 6: Final answer
    x = 34,657.59

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.