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Finding the Third Proportional to 109 and 118.50

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Solution

The third proportional to 109 and 118.50 is: 128.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    109 : 118.50 = 118.50 : x
  2. Step 2: Convert to fraction form
    109/118.50 = 118.50/x
  3. Step 3: Cross multiply
    109x = 118.50 × 118.50
  4. Step 4: Simplify right side
    109x = 14,042.25
  5. Step 5: Solve for x
    x = 14,042.25/109
  6. Step 6: Final answer
    x = 128.83

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.