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Finding the Fourth Proportional to 154.58, 231.96 and 86.16

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Solution

The fourth proportional to 154.58, 231.96 and 86.16 is: 129.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.58 : 231.96 = 86.16 : x
  2. Step 2: Convert to fraction form
    154.58/231.96 = 86.16/x
  3. Step 3: Cross multiply
    154.58x = 231.96 × 86.16
  4. Step 4: Simplify right side
    154.58x = 19,985.67
  5. Step 5: Solve for x
    x = 19,985.67/154.58
  6. Step 6: Final answer
    x = 129.29

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