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Finding the Fourth Proportional to 73.92, 110.76 and 71.28

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Solution

The fourth proportional to 73.92, 110.76 and 71.28 is: 106.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    73.92 : 110.76 = 71.28 : x
  2. Step 2: Convert to fraction form
    73.92/110.76 = 71.28/x
  3. Step 3: Cross multiply
    73.92x = 110.76 × 71.28
  4. Step 4: Simplify right side
    73.92x = 7,894.97
  5. Step 5: Solve for x
    x = 7,894.97/73.92
  6. Step 6: Final answer
    x = 106.80

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