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Finding the Third Proportional to 85 and 161.25

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Solution

The third proportional to 85 and 161.25 is: 305.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 161.25 = 161.25 : x
  2. Step 2: Convert to fraction form
    85/161.25 = 161.25/x
  3. Step 3: Cross multiply
    85x = 161.25 × 161.25
  4. Step 4: Simplify right side
    85x = 26,001.56
  5. Step 5: Solve for x
    x = 26,001.56/85
  6. Step 6: Final answer
    x = 305.90

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.