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Finding the Fourth Proportional to 576.81, 865.79 and 391.14

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Solution

The fourth proportional to 576.81, 865.79 and 391.14 is: 587.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.81 : 865.79 = 391.14 : x
  2. Step 2: Convert to fraction form
    576.81/865.79 = 391.14/x
  3. Step 3: Cross multiply
    576.81x = 865.79 × 391.14
  4. Step 4: Simplify right side
    576.81x = 338,643.14
  5. Step 5: Solve for x
    x = 338,643.14/576.81
  6. Step 6: Final answer
    x = 587.10

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