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Finding the Third Proportional to 218.44 and 338.63

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Solution

The third proportional to 218.44 and 338.63 is: 524.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.44 : 338.63 = 338.63 : x
  2. Step 2: Convert to fraction form
    218.44/338.63 = 338.63/x
  3. Step 3: Cross multiply
    218.44x = 338.63 × 338.63
  4. Step 4: Simplify right side
    218.44x = 114,666.89
  5. Step 5: Solve for x
    x = 114,666.89/218.44
  6. Step 6: Final answer
    x = 524.94

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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.