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Finding the Third Proportional to 85 and 215

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Solution

The third proportional to 85 and 215 is: 543.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 215 = 215 : x
  2. Step 2: Convert to fraction form
    85/215 = 215/x
  3. Step 3: Cross multiply
    85x = 215 × 215
  4. Step 4: Simplify right side
    85x = 46,225
  5. Step 5: Solve for x
    x = 46,225/85
  6. Step 6: Final answer
    x = 543.82

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Why These Related Problems?

These problems maintain the same ratio (2.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.