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Finding the Third Proportional to 381.38 and 779.20

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Solution

The third proportional to 381.38 and 779.20 is: 1,592.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.38 : 779.20 = 779.20 : x
  2. Step 2: Convert to fraction form
    381.38/779.20 = 779.20/x
  3. Step 3: Cross multiply
    381.38x = 779.20 × 779.20
  4. Step 4: Simplify right side
    381.38x = 607,157.51
  5. Step 5: Solve for x
    x = 607,157.51/381.38
  6. Step 6: Final answer
    x = 1,592.02

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Why These Related Problems?

These problems maintain the same ratio (2.04) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.