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Finding the Third Proportional to 18.75 and 51

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Solution

The third proportional to 18.75 and 51 is: 138.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.75 : 51 = 51 : x
  2. Step 2: Convert to fraction form
    18.75/51 = 51/x
  3. Step 3: Cross multiply
    18.75x = 51 × 51
  4. Step 4: Simplify right side
    18.75x = 2,601
  5. Step 5: Solve for x
    x = 2,601/18.75
  6. Step 6: Final answer
    x = 138.72

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Why These Related Problems?

These problems maintain the same ratio (2.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.