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Finding the Third Proportional to 218.13 and 286.69

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Solution

The third proportional to 218.13 and 286.69 is: 376.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.13 : 286.69 = 286.69 : x
  2. Step 2: Convert to fraction form
    218.13/286.69 = 286.69/x
  3. Step 3: Cross multiply
    218.13x = 286.69 × 286.69
  4. Step 4: Simplify right side
    218.13x = 82,189.72
  5. Step 5: Solve for x
    x = 82,189.72/218.13
  6. Step 6: Final answer
    x = 376.80

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.