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Finding the Third Proportional to 378 and 816.75

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Solution

The third proportional to 378 and 816.75 is: 1,764.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    378 : 816.75 = 816.75 : x
  2. Step 2: Convert to fraction form
    378/816.75 = 816.75/x
  3. Step 3: Cross multiply
    378x = 816.75 × 816.75
  4. Step 4: Simplify right side
    378x = 667,080.56
  5. Step 5: Solve for x
    x = 667,080.56/378
  6. Step 6: Final answer
    x = 1,764.76

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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.