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Finding the Fourth Proportional to 79.21, 118.63 and 38.64

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Solution

The fourth proportional to 79.21, 118.63 and 38.64 is: 57.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.21 : 118.63 = 38.64 : x
  2. Step 2: Convert to fraction form
    79.21/118.63 = 38.64/x
  3. Step 3: Cross multiply
    79.21x = 118.63 × 38.64
  4. Step 4: Simplify right side
    79.21x = 4,584.36
  5. Step 5: Solve for x
    x = 4,584.36/79.21
  6. Step 6: Final answer
    x = 57.88

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