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Finding the Fourth Proportional to 639.64, 882.68 and 359.89

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Solution

The fourth proportional to 639.64, 882.68 and 359.89 is: 496.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.64 : 882.68 = 359.89 : x
  2. Step 2: Convert to fraction form
    639.64/882.68 = 359.89/x
  3. Step 3: Cross multiply
    639.64x = 882.68 × 359.89
  4. Step 4: Simplify right side
    639.64x = 317,667.71
  5. Step 5: Solve for x
    x = 317,667.71/639.64
  6. Step 6: Final answer
    x = 496.64

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