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Finding the Third Proportional to 391.22 and 839.81

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Solution

The third proportional to 391.22 and 839.81 is: 1,802.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.22 : 839.81 = 839.81 : x
  2. Step 2: Convert to fraction form
    391.22/839.81 = 839.81/x
  3. Step 3: Cross multiply
    391.22x = 839.81 × 839.81
  4. Step 4: Simplify right side
    391.22x = 705,285.04
  5. Step 5: Solve for x
    x = 705,285.04/391.22
  6. Step 6: Final answer
    x = 1,802.79

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.