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Finding the Third Proportional to 378.75 and 786.56

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Solution

The third proportional to 378.75 and 786.56 is: 1,633.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.75 : 786.56 = 786.56 : x
  2. Step 2: Convert to fraction form
    378.75/786.56 = 786.56/x
  3. Step 3: Cross multiply
    378.75x = 786.56 × 786.56
  4. Step 4: Simplify right side
    378.75x = 618,680.57
  5. Step 5: Solve for x
    x = 618,680.57/378.75
  6. Step 6: Final answer
    x = 1,633.48

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.