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Finding the Third Proportional to 87.19 and 149.91

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Solution

The third proportional to 87.19 and 149.91 is: 257.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.19 : 149.91 = 149.91 : x
  2. Step 2: Convert to fraction form
    87.19/149.91 = 149.91/x
  3. Step 3: Cross multiply
    87.19x = 149.91 × 149.91
  4. Step 4: Simplify right side
    87.19x = 22,471.88
  5. Step 5: Solve for x
    x = 22,471.88/87.19
  6. Step 6: Final answer
    x = 257.74

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Why These Related Problems?

These problems maintain the same ratio (1.72) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.