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Finding the Third Proportional to 391.50 and 867.38

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Solution

The third proportional to 391.50 and 867.38 is: 1,921.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.50 : 867.38 = 867.38 : x
  2. Step 2: Convert to fraction form
    391.50/867.38 = 867.38/x
  3. Step 3: Cross multiply
    391.50x = 867.38 × 867.38
  4. Step 4: Simplify right side
    391.50x = 752,339.39
  5. Step 5: Solve for x
    x = 752,339.39/391.50
  6. Step 6: Final answer
    x = 1,921.68

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.