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Finding the Fourth Proportional to 135.97, 188.52 and 128.68

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Solution

The fourth proportional to 135.97, 188.52 and 128.68 is: 178.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    135.97 : 188.52 = 128.68 : x
  2. Step 2: Convert to fraction form
    135.97/188.52 = 128.68/x
  3. Step 3: Cross multiply
    135.97x = 188.52 × 128.68
  4. Step 4: Simplify right side
    135.97x = 24,258.75
  5. Step 5: Solve for x
    x = 24,258.75/135.97
  6. Step 6: Final answer
    x = 178.41

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.