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Finding the Third Proportional to 108 and 216

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Solution

The third proportional to 108 and 216 is: 432

Step by Step Solution

  1. Step 1: Write the proportion equation
    108 : 216 = 216 : x
  2. Step 2: Convert to fraction form
    108/216 = 216/x
  3. Step 3: Cross multiply
    108x = 216 × 216
  4. Step 4: Simplify right side
    108x = 46,656
  5. Step 5: Solve for x
    x = 46,656/108
  6. Step 6: Final answer
    x = 432

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Why These Related Problems?

These problems maintain the same ratio (2) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.