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Finding the Fourth Proportional to 381.27, 572.08 and 279.40

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Solution

The fourth proportional to 381.27, 572.08 and 279.40 is: 419.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.27 : 572.08 = 279.40 : x
  2. Step 2: Convert to fraction form
    381.27/572.08 = 279.40/x
  3. Step 3: Cross multiply
    381.27x = 572.08 × 279.40
  4. Step 4: Simplify right side
    381.27x = 159,838.62
  5. Step 5: Solve for x
    x = 159,838.62/381.27
  6. Step 6: Final answer
    x = 419.22

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