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Finding the Third Proportional to 87 and 165

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Solution

The third proportional to 87 and 165 is: 312.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    87 : 165 = 165 : x
  2. Step 2: Convert to fraction form
    87/165 = 165/x
  3. Step 3: Cross multiply
    87x = 165 × 165
  4. Step 4: Simplify right side
    87x = 27,225
  5. Step 5: Solve for x
    x = 27,225/87
  6. Step 6: Final answer
    x = 312.93

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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.