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Finding the Third Proportional to 72.50 and 85

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Solution

The third proportional to 72.50 and 85 is: 99.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.50 : 85 = 85 : x
  2. Step 2: Convert to fraction form
    72.50/85 = 85/x
  3. Step 3: Cross multiply
    72.50x = 85 × 85
  4. Step 4: Simplify right side
    72.50x = 7,225
  5. Step 5: Solve for x
    x = 7,225/72.50
  6. Step 6: Final answer
    x = 99.66

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Why These Related Problems?

These problems maintain the same ratio (1.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.