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Finding the Third Proportional to 389,618 and 699,694

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Solution

The third proportional to 389,618 and 699,694 is: 1,256,542.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,618 : 699,694 = 699,694 : x
  2. Step 2: Convert to fraction form
    389,618/699,694 = 699,694/x
  3. Step 3: Cross multiply
    389,618x = 699,694 × 699,694
  4. Step 4: Simplify right side
    389,618x = 489,571,693,636
  5. Step 5: Solve for x
    x = 489,571,693,636/389,618
  6. Step 6: Final answer
    x = 1,256,542.80

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.