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Finding the Third Proportional to 128.25 and 278.44

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Solution

The third proportional to 128.25 and 278.44 is: 604.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.25 : 278.44 = 278.44 : x
  2. Step 2: Convert to fraction form
    128.25/278.44 = 278.44/x
  3. Step 3: Cross multiply
    128.25x = 278.44 × 278.44
  4. Step 4: Simplify right side
    128.25x = 77,527.44
  5. Step 5: Solve for x
    x = 77,527.44/128.25
  6. Step 6: Final answer
    x = 604.50

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.