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Finding the Third Proportional to 247,879 and 393,959

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Solution

The third proportional to 247,879 and 393,959 is: 626,126.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    247,879 : 393,959 = 393,959 : x
  2. Step 2: Convert to fraction form
    247,879/393,959 = 393,959/x
  3. Step 3: Cross multiply
    247,879x = 393,959 × 393,959
  4. Step 4: Simplify right side
    247,879x = 155,203,693,681
  5. Step 5: Solve for x
    x = 155,203,693,681/247,879
  6. Step 6: Final answer
    x = 626,126.83

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.