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Finding the Third Proportional to 128.88 and 281.81

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Solution

The third proportional to 128.88 and 281.81 is: 616.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.88 : 281.81 = 281.81 : x
  2. Step 2: Convert to fraction form
    128.88/281.81 = 281.81/x
  3. Step 3: Cross multiply
    128.88x = 281.81 × 281.81
  4. Step 4: Simplify right side
    128.88x = 79,418.29
  5. Step 5: Solve for x
    x = 79,418.29/128.88
  6. Step 6: Final answer
    x = 616.21

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.