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Finding the Third Proportional to 639,739 and 1,378,620

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Solution

The third proportional to 639,739 and 1,378,620 is: 2,970,888.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,739 : 1,378,620 = 1,378,620 : x
  2. Step 2: Convert to fraction form
    639,739/1,378,620 = 1,378,620/x
  3. Step 3: Cross multiply
    639,739x = 1,378,620 × 1,378,620
  4. Step 4: Simplify right side
    639,739x = 1,900,593,104,400
  5. Step 5: Solve for x
    x = 1,900,593,104,400/639,739
  6. Step 6: Final answer
    x = 2,970,888.29

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.