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Finding the Third Proportional to 393,920 and 859,112

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Solution

The third proportional to 393,920 and 859,112 is: 1,873,663.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,920 : 859,112 = 859,112 : x
  2. Step 2: Convert to fraction form
    393,920/859,112 = 859,112/x
  3. Step 3: Cross multiply
    393,920x = 859,112 × 859,112
  4. Step 4: Simplify right side
    393,920x = 738,073,428,544
  5. Step 5: Solve for x
    x = 738,073,428,544/393,920
  6. Step 6: Final answer
    x = 1,873,663.25

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.