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Finding the Fourth Proportional to 78.76, 118.41 and 51.76

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Solution

The fourth proportional to 78.76, 118.41 and 51.76 is: 77.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.76 : 118.41 = 51.76 : x
  2. Step 2: Convert to fraction form
    78.76/118.41 = 51.76/x
  3. Step 3: Cross multiply
    78.76x = 118.41 × 51.76
  4. Step 4: Simplify right side
    78.76x = 6,128.90
  5. Step 5: Solve for x
    x = 6,128.90/78.76
  6. Step 6: Final answer
    x = 77.82

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