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Finding the Fourth Proportional to 269.22, 403.88 and 86.60

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Solution

The fourth proportional to 269.22, 403.88 and 86.60 is: 129.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    269.22 : 403.88 = 86.60 : x
  2. Step 2: Convert to fraction form
    269.22/403.88 = 86.60/x
  3. Step 3: Cross multiply
    269.22x = 403.88 × 86.60
  4. Step 4: Simplify right side
    269.22x = 34,976.01
  5. Step 5: Solve for x
    x = 34,976.01/269.22
  6. Step 6: Final answer
    x = 129.92

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