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Finding the Third Proportional to 218.63 and 331.31

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Solution

The third proportional to 218.63 and 331.31 is: 502.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.63 : 331.31 = 331.31 : x
  2. Step 2: Convert to fraction form
    218.63/331.31 = 331.31/x
  3. Step 3: Cross multiply
    218.63x = 331.31 × 331.31
  4. Step 4: Simplify right side
    218.63x = 109,767.97
  5. Step 5: Solve for x
    x = 109,767.97/218.63
  6. Step 6: Final answer
    x = 502.08

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.