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Finding the Third Proportional to 128 and 188

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Solution

The third proportional to 128 and 188 is: 276.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    128 : 188 = 188 : x
  2. Step 2: Convert to fraction form
    128/188 = 188/x
  3. Step 3: Cross multiply
    128x = 188 × 188
  4. Step 4: Simplify right side
    128x = 35,344
  5. Step 5: Solve for x
    x = 35,344/128
  6. Step 6: Final answer
    x = 276.13

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Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.