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Finding the Third Proportional to 128 and 186

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Solution

The third proportional to 128 and 186 is: 270.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 186 = 186 : x
  2. Step 2: Convert to fraction form
    128/186 = 186/x
  3. Step 3: Cross multiply
    128x = 186 × 186
  4. Step 4: Simplify right side
    128x = 34,596
  5. Step 5: Solve for x
    x = 34,596/128
  6. Step 6: Final answer
    x = 270.28

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Why These Related Problems?

These problems maintain the same ratio (1.45) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.