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Finding the Fourth Proportional to 386.24, 579.44 and 142.78

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Solution

The fourth proportional to 386.24, 579.44 and 142.78 is: 214.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.24 : 579.44 = 142.78 : x
  2. Step 2: Convert to fraction form
    386.24/579.44 = 142.78/x
  3. Step 3: Cross multiply
    386.24x = 579.44 × 142.78
  4. Step 4: Simplify right side
    386.24x = 82,732.44
  5. Step 5: Solve for x
    x = 82,732.44/386.24
  6. Step 6: Final answer
    x = 214.20

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