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Finding the Fourth Proportional to 387.38, 581.21 and 143.94

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Solution

The fourth proportional to 387.38, 581.21 and 143.94 is: 215.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.38 : 581.21 = 143.94 : x
  2. Step 2: Convert to fraction form
    387.38/581.21 = 143.94/x
  3. Step 3: Cross multiply
    387.38x = 581.21 × 143.94
  4. Step 4: Simplify right side
    387.38x = 83,661.37
  5. Step 5: Solve for x
    x = 83,661.37/387.38
  6. Step 6: Final answer
    x = 215.97

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