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Finding the Third Proportional to 87.66 and 189.09

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Solution

The third proportional to 87.66 and 189.09 is: 407.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.66 : 189.09 = 189.09 : x
  2. Step 2: Convert to fraction form
    87.66/189.09 = 189.09/x
  3. Step 3: Cross multiply
    87.66x = 189.09 × 189.09
  4. Step 4: Simplify right side
    87.66x = 35,756.45
  5. Step 5: Solve for x
    x = 35,756.45/87.66
  6. Step 6: Final answer
    x = 407.92

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.