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Finding the Fourth Proportional to 129.74, 179.21 and 128.82

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Solution

The fourth proportional to 129.74, 179.21 and 128.82 is: 177.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.74 : 179.21 = 128.82 : x
  2. Step 2: Convert to fraction form
    129.74/179.21 = 128.82/x
  3. Step 3: Cross multiply
    129.74x = 179.21 × 128.82
  4. Step 4: Simplify right side
    129.74x = 23,086.83
  5. Step 5: Solve for x
    x = 23,086.83/129.74
  6. Step 6: Final answer
    x = 177.95

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