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Finding the Fourth Proportional to 426.44, 639.68 and 243.74

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Solution

The fourth proportional to 426.44, 639.68 and 243.74 is: 365.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.44 : 639.68 = 243.74 : x
  2. Step 2: Convert to fraction form
    426.44/639.68 = 243.74/x
  3. Step 3: Cross multiply
    426.44x = 639.68 × 243.74
  4. Step 4: Simplify right side
    426.44x = 155,915.98
  5. Step 5: Solve for x
    x = 155,915.98/426.44
  6. Step 6: Final answer
    x = 365.62

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