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Finding the Fourth Proportional to 128.03, 191.82 and 76.73

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Solution

The fourth proportional to 128.03, 191.82 and 76.73 is: 114.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.03 : 191.82 = 76.73 : x
  2. Step 2: Convert to fraction form
    128.03/191.82 = 76.73/x
  3. Step 3: Cross multiply
    128.03x = 191.82 × 76.73
  4. Step 4: Simplify right side
    128.03x = 14,718.35
  5. Step 5: Solve for x
    x = 14,718.35/128.03
  6. Step 6: Final answer
    x = 114.96

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