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Finding the Third Proportional to 638.93 and 1,380.38

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Solution

The third proportional to 638.93 and 1,380.38 is: 2,982.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.93 : 1,380.38 = 1,380.38 : x
  2. Step 2: Convert to fraction form
    638.93/1,380.38 = 1,380.38/x
  3. Step 3: Cross multiply
    638.93x = 1,380.38 × 1,380.38
  4. Step 4: Simplify right side
    638.93x = 1,905,435.14
  5. Step 5: Solve for x
    x = 1,905,435.14/638.93
  6. Step 6: Final answer
    x = 2,982.23

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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.