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Finding the Fourth Proportional to 279, 418.20 and 134.40

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Solution

The fourth proportional to 279, 418.20 and 134.40 is: 201.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    279 : 418.20 = 134.40 : x
  2. Step 2: Convert to fraction form
    279/418.20 = 134.40/x
  3. Step 3: Cross multiply
    279x = 418.20 × 134.40
  4. Step 4: Simplify right side
    279x = 56,206.08
  5. Step 5: Solve for x
    x = 56,206.08/279
  6. Step 6: Final answer
    x = 201.46

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