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Finding the Third Proportional to 80.91 and 128.58

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Solution

The third proportional to 80.91 and 128.58 is: 204.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.91 : 128.58 = 128.58 : x
  2. Step 2: Convert to fraction form
    80.91/128.58 = 128.58/x
  3. Step 3: Cross multiply
    80.91x = 128.58 × 128.58
  4. Step 4: Simplify right side
    80.91x = 16,532.33
  5. Step 5: Solve for x
    x = 16,532.33/80.91
  6. Step 6: Final answer
    x = 204.34

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.