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Finding the Fourth Proportional to 77.05, 115.54 and 28.95

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Solution

The fourth proportional to 77.05, 115.54 and 28.95 is: 43.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    77.05 : 115.54 = 28.95 : x
  2. Step 2: Convert to fraction form
    77.05/115.54 = 28.95/x
  3. Step 3: Cross multiply
    77.05x = 115.54 × 28.95
  4. Step 4: Simplify right side
    77.05x = 3,344.88
  5. Step 5: Solve for x
    x = 3,344.88/77.05
  6. Step 6: Final answer
    x = 43.41

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