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Finding the Third Proportional to 87.66 and 90.19

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Solution

The third proportional to 87.66 and 90.19 is: 92.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.66 : 90.19 = 90.19 : x
  2. Step 2: Convert to fraction form
    87.66/90.19 = 90.19/x
  3. Step 3: Cross multiply
    87.66x = 90.19 × 90.19
  4. Step 4: Simplify right side
    87.66x = 8,133.79
  5. Step 5: Solve for x
    x = 8,133.79/87.66
  6. Step 6: Final answer
    x = 92.79

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Why These Related Problems?

These problems maintain the same ratio (1.03) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.