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Finding the Fourth Proportional to 640.38, 960.48 and 347.76

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Solution

The fourth proportional to 640.38, 960.48 and 347.76 is: 521.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.38 : 960.48 = 347.76 : x
  2. Step 2: Convert to fraction form
    640.38/960.48 = 347.76/x
  3. Step 3: Cross multiply
    640.38x = 960.48 × 347.76
  4. Step 4: Simplify right side
    640.38x = 334,016.52
  5. Step 5: Solve for x
    x = 334,016.52/640.38
  6. Step 6: Final answer
    x = 521.59

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