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Finding the Third Proportional to 13,643 and 20,861

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Solution

The third proportional to 13,643 and 20,861 is: 31,897.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,643 : 20,861 = 20,861 : x
  2. Step 2: Convert to fraction form
    13,643/20,861 = 20,861/x
  3. Step 3: Cross multiply
    13,643x = 20,861 × 20,861
  4. Step 4: Simplify right side
    13,643x = 435,181,321
  5. Step 5: Solve for x
    x = 435,181,321/13,643
  6. Step 6: Final answer
    x = 31,897.77

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.