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Finding the Fourth Proportional to 427.31, 640.96 and 153.41

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Solution

The fourth proportional to 427.31, 640.96 and 153.41 is: 230.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.31 : 640.96 = 153.41 : x
  2. Step 2: Convert to fraction form
    427.31/640.96 = 153.41/x
  3. Step 3: Cross multiply
    427.31x = 640.96 × 153.41
  4. Step 4: Simplify right side
    427.31x = 98,330.89
  5. Step 5: Solve for x
    x = 98,330.89/427.31
  6. Step 6: Final answer
    x = 230.12

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