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Finding the Fourth Proportional to 660.71, 990.83 and 227.76

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Solution

The fourth proportional to 660.71, 990.83 and 227.76 is: 341.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.71 : 990.83 = 227.76 : x
  2. Step 2: Convert to fraction form
    660.71/990.83 = 227.76/x
  3. Step 3: Cross multiply
    660.71x = 990.83 × 227.76
  4. Step 4: Simplify right side
    660.71x = 225,670.30
  5. Step 5: Solve for x
    x = 225,670.30/660.71
  6. Step 6: Final answer
    x = 341.56

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