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Finding the Third Proportional to 379.75 and 815.75

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Solution

The third proportional to 379.75 and 815.75 is: 1,752.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.75 : 815.75 = 815.75 : x
  2. Step 2: Convert to fraction form
    379.75/815.75 = 815.75/x
  3. Step 3: Cross multiply
    379.75x = 815.75 × 815.75
  4. Step 4: Simplify right side
    379.75x = 665,448.06
  5. Step 5: Solve for x
    x = 665,448.06/379.75
  6. Step 6: Final answer
    x = 1,752.33

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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.