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Finding the Third Proportional to 11.25 and 18.75

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Solution

The third proportional to 11.25 and 18.75 is: 31.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.25 : 18.75 = 18.75 : x
  2. Step 2: Convert to fraction form
    11.25/18.75 = 18.75/x
  3. Step 3: Cross multiply
    11.25x = 18.75 × 18.75
  4. Step 4: Simplify right side
    11.25x = 351.56
  5. Step 5: Solve for x
    x = 351.56/11.25
  6. Step 6: Final answer
    x = 31.25

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Why These Related Problems?

These problems maintain the same ratio (1.67) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.