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Finding the Fourth Proportional to 70.72, 106.08 and 38.64

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Solution

The fourth proportional to 70.72, 106.08 and 38.64 is: 57.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    70.72 : 106.08 = 38.64 : x
  2. Step 2: Convert to fraction form
    70.72/106.08 = 38.64/x
  3. Step 3: Cross multiply
    70.72x = 106.08 × 38.64
  4. Step 4: Simplify right side
    70.72x = 4,098.93
  5. Step 5: Solve for x
    x = 4,098.93/70.72
  6. Step 6: Final answer
    x = 57.96

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