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Finding the Fourth Proportional to 72.06, 107.88 and 51.64

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Solution

The fourth proportional to 72.06, 107.88 and 51.64 is: 77.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.06 : 107.88 = 51.64 : x
  2. Step 2: Convert to fraction form
    72.06/107.88 = 51.64/x
  3. Step 3: Cross multiply
    72.06x = 107.88 × 51.64
  4. Step 4: Simplify right side
    72.06x = 5,570.92
  5. Step 5: Solve for x
    x = 5,570.92/72.06
  6. Step 6: Final answer
    x = 77.31

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