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Finding the Fourth Proportional to 272.12, 407.98 and 89.42

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Solution

The fourth proportional to 272.12, 407.98 and 89.42 is: 134.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    272.12 : 407.98 = 89.42 : x
  2. Step 2: Convert to fraction form
    272.12/407.98 = 89.42/x
  3. Step 3: Cross multiply
    272.12x = 407.98 × 89.42
  4. Step 4: Simplify right side
    272.12x = 36,481.57
  5. Step 5: Solve for x
    x = 36,481.57/272.12
  6. Step 6: Final answer
    x = 134.06

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