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Finding the Third Proportional to 18,320 and 19,856

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Solution

The third proportional to 18,320 and 19,856 is: 21,520.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,320 : 19,856 = 19,856 : x
  2. Step 2: Convert to fraction form
    18,320/19,856 = 19,856/x
  3. Step 3: Cross multiply
    18,320x = 19,856 × 19,856
  4. Step 4: Simplify right side
    18,320x = 394,260,736
  5. Step 5: Solve for x
    x = 394,260,736/18,320
  6. Step 6: Final answer
    x = 21,520.78

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.