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Finding the Fourth Proportional to 330.11, 495.17 and 86.66

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Solution

The fourth proportional to 330.11, 495.17 and 86.66 is: 129.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.11 : 495.17 = 86.66 : x
  2. Step 2: Convert to fraction form
    330.11/495.17 = 86.66/x
  3. Step 3: Cross multiply
    330.11x = 495.17 × 86.66
  4. Step 4: Simplify right side
    330.11x = 42,908.52
  5. Step 5: Solve for x
    x = 42,908.52/330.11
  6. Step 6: Final answer
    x = 129.98

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