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Finding the Third Proportional to 129,138 and 279,720

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Solution

The third proportional to 129,138 and 279,720 is: 605,888.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,138 : 279,720 = 279,720 : x
  2. Step 2: Convert to fraction form
    129,138/279,720 = 279,720/x
  3. Step 3: Cross multiply
    129,138x = 279,720 × 279,720
  4. Step 4: Simplify right side
    129,138x = 78,243,278,400
  5. Step 5: Solve for x
    x = 78,243,278,400/129,138
  6. Step 6: Final answer
    x = 605,888.88

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.