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Finding the Third Proportional to 391,988 and 858,706

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Solution

The third proportional to 391,988 and 858,706 is: 1,881,118.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,988 : 858,706 = 858,706 : x
  2. Step 2: Convert to fraction form
    391,988/858,706 = 858,706/x
  3. Step 3: Cross multiply
    391,988x = 858,706 × 858,706
  4. Step 4: Simplify right side
    391,988x = 737,375,994,436
  5. Step 5: Solve for x
    x = 737,375,994,436/391,988
  6. Step 6: Final answer
    x = 1,881,118.80

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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.