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Finding the Third Proportional to 381.66 and 679.78

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Solution

The third proportional to 381.66 and 679.78 is: 1,210.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.66 : 679.78 = 679.78 : x
  2. Step 2: Convert to fraction form
    381.66/679.78 = 679.78/x
  3. Step 3: Cross multiply
    381.66x = 679.78 × 679.78
  4. Step 4: Simplify right side
    381.66x = 462,102.55
  5. Step 5: Solve for x
    x = 462,102.55/381.66
  6. Step 6: Final answer
    x = 1,210.78

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.