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Finding the Third Proportional to 87.13 and 121.88

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Solution

The third proportional to 87.13 and 121.88 is: 170.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.13 : 121.88 = 121.88 : x
  2. Step 2: Convert to fraction form
    87.13/121.88 = 121.88/x
  3. Step 3: Cross multiply
    87.13x = 121.88 × 121.88
  4. Step 4: Simplify right side
    87.13x = 14,853.52
  5. Step 5: Solve for x
    x = 14,853.52/87.13
  6. Step 6: Final answer
    x = 170.49

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.