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Finding the Third Proportional to 11.50 and 18

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Solution

The third proportional to 11.50 and 18 is: 28.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.50 : 18 = 18 : x
  2. Step 2: Convert to fraction form
    11.50/18 = 18/x
  3. Step 3: Cross multiply
    11.50x = 18 × 18
  4. Step 4: Simplify right side
    11.50x = 324
  5. Step 5: Solve for x
    x = 324/11.50
  6. Step 6: Final answer
    x = 28.17

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.