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Finding the Third Proportional to 108 and 122.25

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Solution

The third proportional to 108 and 122.25 is: 138.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    108 : 122.25 = 122.25 : x
  2. Step 2: Convert to fraction form
    108/122.25 = 122.25/x
  3. Step 3: Cross multiply
    108x = 122.25 × 122.25
  4. Step 4: Simplify right side
    108x = 14,945.06
  5. Step 5: Solve for x
    x = 14,945.06/108
  6. Step 6: Final answer
    x = 138.38

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.