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Finding the Fourth Proportional to 159.82, 239.79 and 78.66

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Solution

The fourth proportional to 159.82, 239.79 and 78.66 is: 118.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.82 : 239.79 = 78.66 : x
  2. Step 2: Convert to fraction form
    159.82/239.79 = 78.66/x
  3. Step 3: Cross multiply
    159.82x = 239.79 × 78.66
  4. Step 4: Simplify right side
    159.82x = 18,862.18
  5. Step 5: Solve for x
    x = 18,862.18/159.82
  6. Step 6: Final answer
    x = 118.02

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