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Finding the Fourth Proportional to 386.12, 579.06 and 142.58

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Solution

The fourth proportional to 386.12, 579.06 and 142.58 is: 213.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.12 : 579.06 = 142.58 : x
  2. Step 2: Convert to fraction form
    386.12/579.06 = 142.58/x
  3. Step 3: Cross multiply
    386.12x = 579.06 × 142.58
  4. Step 4: Simplify right side
    386.12x = 82,562.37
  5. Step 5: Solve for x
    x = 82,562.37/386.12
  6. Step 6: Final answer
    x = 213.83

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