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Finding the Third Proportional to 128 and 238.75

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Solution

The third proportional to 128 and 238.75 is: 445.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 238.75 = 238.75 : x
  2. Step 2: Convert to fraction form
    128/238.75 = 238.75/x
  3. Step 3: Cross multiply
    128x = 238.75 × 238.75
  4. Step 4: Simplify right side
    128x = 57,001.56
  5. Step 5: Solve for x
    x = 57,001.56/128
  6. Step 6: Final answer
    x = 445.32

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Why These Related Problems?

These problems maintain the same ratio (1.87) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.