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Finding the Fourth Proportional to 311.06, 466.54 and 128.47

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Solution

The fourth proportional to 311.06, 466.54 and 128.47 is: 192.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.06 : 466.54 = 128.47 : x
  2. Step 2: Convert to fraction form
    311.06/466.54 = 128.47/x
  3. Step 3: Cross multiply
    311.06x = 466.54 × 128.47
  4. Step 4: Simplify right side
    311.06x = 59,936.39
  5. Step 5: Solve for x
    x = 59,936.39/311.06
  6. Step 6: Final answer
    x = 192.68

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