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Finding the Fourth Proportional to 330.21, 495.36 and 261.86

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Solution

The fourth proportional to 330.21, 495.36 and 261.86 is: 392.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.21 : 495.36 = 261.86 : x
  2. Step 2: Convert to fraction form
    330.21/495.36 = 261.86/x
  3. Step 3: Cross multiply
    330.21x = 495.36 × 261.86
  4. Step 4: Simplify right side
    330.21x = 129,714.97
  5. Step 5: Solve for x
    x = 129,714.97/330.21
  6. Step 6: Final answer
    x = 392.83

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