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Finding the Third Proportional to 639,645 and 1,378,930

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Solution

The third proportional to 639,645 and 1,378,930 is: 2,972,661.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,645 : 1,378,930 = 1,378,930 : x
  2. Step 2: Convert to fraction form
    639,645/1,378,930 = 1,378,930/x
  3. Step 3: Cross multiply
    639,645x = 1,378,930 × 1,378,930
  4. Step 4: Simplify right side
    639,645x = 1,901,447,944,900
  5. Step 5: Solve for x
    x = 1,901,447,944,900/639,645
  6. Step 6: Final answer
    x = 2,972,661.31

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.