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Finding the Third Proportional to 128.74 and 188.68

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Solution

The third proportional to 128.74 and 188.68 is: 276.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.74 : 188.68 = 188.68 : x
  2. Step 2: Convert to fraction form
    128.74/188.68 = 188.68/x
  3. Step 3: Cross multiply
    128.74x = 188.68 × 188.68
  4. Step 4: Simplify right side
    128.74x = 35,601.50
  5. Step 5: Solve for x
    x = 35,601.50/128.74
  6. Step 6: Final answer
    x = 276.53

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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.