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Finding the Third Proportional to 111 and 119.75

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Solution

The third proportional to 111 and 119.75 is: 129.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    111 : 119.75 = 119.75 : x
  2. Step 2: Convert to fraction form
    111/119.75 = 119.75/x
  3. Step 3: Cross multiply
    111x = 119.75 × 119.75
  4. Step 4: Simplify right side
    111x = 14,340.06
  5. Step 5: Solve for x
    x = 14,340.06/111
  6. Step 6: Final answer
    x = 129.19

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.