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Finding the Fourth Proportional to 102.88, 154.24 and 78.88

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Solution

The fourth proportional to 102.88, 154.24 and 78.88 is: 118.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    102.88 : 154.24 = 78.88 : x
  2. Step 2: Convert to fraction form
    102.88/154.24 = 78.88/x
  3. Step 3: Cross multiply
    102.88x = 154.24 × 78.88
  4. Step 4: Simplify right side
    102.88x = 12,166.45
  5. Step 5: Solve for x
    x = 12,166.45/102.88
  6. Step 6: Final answer
    x = 118.26

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