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Finding the Third Proportional to 128.14 and 281.92

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Solution

The third proportional to 128.14 and 281.92 is: 620.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.14 : 281.92 = 281.92 : x
  2. Step 2: Convert to fraction form
    128.14/281.92 = 281.92/x
  3. Step 3: Cross multiply
    128.14x = 281.92 × 281.92
  4. Step 4: Simplify right side
    128.14x = 79,477.74
  5. Step 5: Solve for x
    x = 79,477.74/128.14
  6. Step 6: Final answer
    x = 620.22

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.