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Finding the Third Proportional to 394.75 and 865.75

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Solution

The third proportional to 394.75 and 865.75 is: 1,898.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.75 : 865.75 = 865.75 : x
  2. Step 2: Convert to fraction form
    394.75/865.75 = 865.75/x
  3. Step 3: Cross multiply
    394.75x = 865.75 × 865.75
  4. Step 4: Simplify right side
    394.75x = 749,523.06
  5. Step 5: Solve for x
    x = 749,523.06/394.75
  6. Step 6: Final answer
    x = 1,898.73

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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.