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Finding the Third Proportional to 17.75 and 39

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Solution

The third proportional to 17.75 and 39 is: 85.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    17.75 : 39 = 39 : x
  2. Step 2: Convert to fraction form
    17.75/39 = 39/x
  3. Step 3: Cross multiply
    17.75x = 39 × 39
  4. Step 4: Simplify right side
    17.75x = 1,521
  5. Step 5: Solve for x
    x = 1,521/17.75
  6. Step 6: Final answer
    x = 85.69

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.