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Finding the Fourth Proportional to 231.21, 346.80 and 86.91

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Solution

The fourth proportional to 231.21, 346.80 and 86.91 is: 130.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.21 : 346.80 = 86.91 : x
  2. Step 2: Convert to fraction form
    231.21/346.80 = 86.91/x
  3. Step 3: Cross multiply
    231.21x = 346.80 × 86.91
  4. Step 4: Simplify right side
    231.21x = 30,140.39
  5. Step 5: Solve for x
    x = 30,140.39/231.21
  6. Step 6: Final answer
    x = 130.36

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