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Finding the Third Proportional to 70.88 and 108.21

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Solution

The third proportional to 70.88 and 108.21 is: 165.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.88 : 108.21 = 108.21 : x
  2. Step 2: Convert to fraction form
    70.88/108.21 = 108.21/x
  3. Step 3: Cross multiply
    70.88x = 108.21 × 108.21
  4. Step 4: Simplify right side
    70.88x = 11,709.61
  5. Step 5: Solve for x
    x = 11,709.61/70.88
  6. Step 6: Final answer
    x = 165.21

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.