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Finding the Third Proportional to 391,668 and 858,990

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Solution

The third proportional to 391,668 and 858,990 is: 1,883,901.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,668 : 858,990 = 858,990 : x
  2. Step 2: Convert to fraction form
    391,668/858,990 = 858,990/x
  3. Step 3: Cross multiply
    391,668x = 858,990 × 858,990
  4. Step 4: Simplify right side
    391,668x = 737,863,820,100
  5. Step 5: Solve for x
    x = 737,863,820,100/391,668
  6. Step 6: Final answer
    x = 1,883,901.21

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.