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Finding the Third Proportional to 389.44 and 855.38

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Solution

The third proportional to 389.44 and 855.38 is: 1,878.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.44 : 855.38 = 855.38 : x
  2. Step 2: Convert to fraction form
    389.44/855.38 = 855.38/x
  3. Step 3: Cross multiply
    389.44x = 855.38 × 855.38
  4. Step 4: Simplify right side
    389.44x = 731,666.39
  5. Step 5: Solve for x
    x = 731,666.39/389.44
  6. Step 6: Final answer
    x = 1,878.78

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.