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Finding the Third Proportional to 278,321 and 620,389

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Solution

The third proportional to 278,321 and 620,389 is: 1,382,872.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,321 : 620,389 = 620,389 : x
  2. Step 2: Convert to fraction form
    278,321/620,389 = 620,389/x
  3. Step 3: Cross multiply
    278,321x = 620,389 × 620,389
  4. Step 4: Simplify right side
    278,321x = 384,882,511,321
  5. Step 5: Solve for x
    x = 384,882,511,321/278,321
  6. Step 6: Final answer
    x = 1,382,872.69

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Why These Related Problems?

These problems maintain the same ratio (2.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.