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Finding the Fourth Proportional to 426.99, 640.80 and 153.21

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Solution

The fourth proportional to 426.99, 640.80 and 153.21 is: 229.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.99 : 640.80 = 153.21 : x
  2. Step 2: Convert to fraction form
    426.99/640.80 = 153.21/x
  3. Step 3: Cross multiply
    426.99x = 640.80 × 153.21
  4. Step 4: Simplify right side
    426.99x = 98,176.97
  5. Step 5: Solve for x
    x = 98,176.97/426.99
  6. Step 6: Final answer
    x = 229.93

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