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Finding the Third Proportional to 391.69 and 844.69

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Solution

The third proportional to 391.69 and 844.69 is: 1,821.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.69 : 844.69 = 844.69 : x
  2. Step 2: Convert to fraction form
    391.69/844.69 = 844.69/x
  3. Step 3: Cross multiply
    391.69x = 844.69 × 844.69
  4. Step 4: Simplify right side
    391.69x = 713,496.97
  5. Step 5: Solve for x
    x = 713,496.97/391.69
  6. Step 6: Final answer
    x = 1,821.60

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.