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Finding the Third Proportional to 218.44 and 339.56

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Solution

The third proportional to 218.44 and 339.56 is: 527.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.44 : 339.56 = 339.56 : x
  2. Step 2: Convert to fraction form
    218.44/339.56 = 339.56/x
  3. Step 3: Cross multiply
    218.44x = 339.56 × 339.56
  4. Step 4: Simplify right side
    218.44x = 115,302.69
  5. Step 5: Solve for x
    x = 115,302.69/218.44
  6. Step 6: Final answer
    x = 527.85

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.