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Finding the Third Proportional to 85 and 100

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Solution

The third proportional to 85 and 100 is: 117.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 100 = 100 : x
  2. Step 2: Convert to fraction form
    85/100 = 100/x
  3. Step 3: Cross multiply
    85x = 100 × 100
  4. Step 4: Simplify right side
    85x = 10,000
  5. Step 5: Solve for x
    x = 10,000/85
  6. Step 6: Final answer
    x = 117.65

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.