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Finding the Fourth Proportional to 78.29, 108.09 and 61.95

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Solution

The fourth proportional to 78.29, 108.09 and 61.95 is: 85.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.29 : 108.09 = 61.95 : x
  2. Step 2: Convert to fraction form
    78.29/108.09 = 61.95/x
  3. Step 3: Cross multiply
    78.29x = 108.09 × 61.95
  4. Step 4: Simplify right side
    78.29x = 6,696.18
  5. Step 5: Solve for x
    x = 6,696.18/78.29
  6. Step 6: Final answer
    x = 85.54

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