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Finding the Fourth Proportional to 428.41, 642.62 and 222.94

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Solution

The fourth proportional to 428.41, 642.62 and 222.94 is: 334.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.41 : 642.62 = 222.94 : x
  2. Step 2: Convert to fraction form
    428.41/642.62 = 222.94/x
  3. Step 3: Cross multiply
    428.41x = 642.62 × 222.94
  4. Step 4: Simplify right side
    428.41x = 143,265.70
  5. Step 5: Solve for x
    x = 143,265.70/428.41
  6. Step 6: Final answer
    x = 334.41

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