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Finding the Fourth Proportional to 318.78, 439.80 and 178.88

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Solution

The fourth proportional to 318.78, 439.80 and 178.88 is: 246.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.78 : 439.80 = 178.88 : x
  2. Step 2: Convert to fraction form
    318.78/439.80 = 178.88/x
  3. Step 3: Cross multiply
    318.78x = 439.80 × 178.88
  4. Step 4: Simplify right side
    318.78x = 78,669.23
  5. Step 5: Solve for x
    x = 78,669.23/318.78
  6. Step 6: Final answer
    x = 246.78

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