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Finding the Third Proportional to 378.50 and 799.75

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Solution

The third proportional to 378.50 and 799.75 is: 1,689.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.50 : 799.75 = 799.75 : x
  2. Step 2: Convert to fraction form
    378.50/799.75 = 799.75/x
  3. Step 3: Cross multiply
    378.50x = 799.75 × 799.75
  4. Step 4: Simplify right side
    378.50x = 639,600.06
  5. Step 5: Solve for x
    x = 639,600.06/378.50
  6. Step 6: Final answer
    x = 1,689.83

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Why These Related Problems?

These problems maintain the same ratio (2.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.