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Finding the Fourth Proportional to 71.11, 98.21 and 64.97

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Solution

The fourth proportional to 71.11, 98.21 and 64.97 is: 89.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.11 : 98.21 = 64.97 : x
  2. Step 2: Convert to fraction form
    71.11/98.21 = 64.97/x
  3. Step 3: Cross multiply
    71.11x = 98.21 × 64.97
  4. Step 4: Simplify right side
    71.11x = 6,380.74
  5. Step 5: Solve for x
    x = 6,380.74/71.11
  6. Step 6: Final answer
    x = 89.73

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