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Finding the Third Proportional to 218.39 and 329.91

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Solution

The third proportional to 218.39 and 329.91 is: 498.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    218.39 : 329.91 = 329.91 : x
  2. Step 2: Convert to fraction form
    218.39/329.91 = 329.91/x
  3. Step 3: Cross multiply
    218.39x = 329.91 × 329.91
  4. Step 4: Simplify right side
    218.39x = 108,838.13
  5. Step 5: Solve for x
    x = 108,838.13/218.39
  6. Step 6: Final answer
    x = 498.36

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.