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Finding the Fourth Proportional to 158.88, 238.16 and 77.61

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Solution

The fourth proportional to 158.88, 238.16 and 77.61 is: 116.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.88 : 238.16 = 77.61 : x
  2. Step 2: Convert to fraction form
    158.88/238.16 = 77.61/x
  3. Step 3: Cross multiply
    158.88x = 238.16 × 77.61
  4. Step 4: Simplify right side
    158.88x = 18,483.21
  5. Step 5: Solve for x
    x = 18,483.21/158.88
  6. Step 6: Final answer
    x = 116.33

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