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Finding the Fourth Proportional to 143.91, 215.97 and 78.94

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Solution

The fourth proportional to 143.91, 215.97 and 78.94 is: 118.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.91 : 215.97 = 78.94 : x
  2. Step 2: Convert to fraction form
    143.91/215.97 = 78.94/x
  3. Step 3: Cross multiply
    143.91x = 215.97 × 78.94
  4. Step 4: Simplify right side
    143.91x = 17,048.65
  5. Step 5: Solve for x
    x = 17,048.65/143.91
  6. Step 6: Final answer
    x = 118.47

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