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Finding the Third Proportional to 309,861 and 656,928

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Solution

The third proportional to 309,861 and 656,928 is: 1,392,735.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,861 : 656,928 = 656,928 : x
  2. Step 2: Convert to fraction form
    309,861/656,928 = 656,928/x
  3. Step 3: Cross multiply
    309,861x = 656,928 × 656,928
  4. Step 4: Simplify right side
    309,861x = 431,554,397,184
  5. Step 5: Solve for x
    x = 431,554,397,184/309,861
  6. Step 6: Final answer
    x = 1,392,735.44

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.