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Finding the Fourth Proportional to 386.13, 578.88 and 142.53

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Solution

The fourth proportional to 386.13, 578.88 and 142.53 is: 213.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.13 : 578.88 = 142.53 : x
  2. Step 2: Convert to fraction form
    386.13/578.88 = 142.53/x
  3. Step 3: Cross multiply
    386.13x = 578.88 × 142.53
  4. Step 4: Simplify right side
    386.13x = 82,507.77
  5. Step 5: Solve for x
    x = 82,507.77/386.13
  6. Step 6: Final answer
    x = 213.68

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