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Finding the Fourth Proportional to 76, 104.82 and 56.40

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Solution

The fourth proportional to 76, 104.82 and 56.40 is: 77.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    76 : 104.82 = 56.40 : x
  2. Step 2: Convert to fraction form
    76/104.82 = 56.40/x
  3. Step 3: Cross multiply
    76x = 104.82 × 56.40
  4. Step 4: Simplify right side
    76x = 5,911.85
  5. Step 5: Solve for x
    x = 5,911.85/76
  6. Step 6: Final answer
    x = 77.79

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