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Finding the Third Proportional to 8,378 and 12,981

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Solution

The third proportional to 8,378 and 12,981 is: 20,112.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,378 : 12,981 = 12,981 : x
  2. Step 2: Convert to fraction form
    8,378/12,981 = 12,981/x
  3. Step 3: Cross multiply
    8,378x = 12,981 × 12,981
  4. Step 4: Simplify right side
    8,378x = 168,506,361
  5. Step 5: Solve for x
    x = 168,506,361/8,378
  6. Step 6: Final answer
    x = 20,112.96

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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.