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Finding the Third Proportional to 8,221 and 12,719

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Solution

The third proportional to 8,221 and 12,719 is: 19,678.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,221 : 12,719 = 12,719 : x
  2. Step 2: Convert to fraction form
    8,221/12,719 = 12,719/x
  3. Step 3: Cross multiply
    8,221x = 12,719 × 12,719
  4. Step 4: Simplify right side
    8,221x = 161,772,961
  5. Step 5: Solve for x
    x = 161,772,961/8,221
  6. Step 6: Final answer
    x = 19,678.01

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.