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Finding the Third Proportional to 12,905 and 20,719

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Solution

The third proportional to 12,905 and 20,719 is: 33,264.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,905 : 20,719 = 20,719 : x
  2. Step 2: Convert to fraction form
    12,905/20,719 = 20,719/x
  3. Step 3: Cross multiply
    12,905x = 20,719 × 20,719
  4. Step 4: Simplify right side
    12,905x = 429,276,961
  5. Step 5: Solve for x
    x = 429,276,961/12,905
  6. Step 6: Final answer
    x = 33,264.39

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.