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Finding the Fourth Proportional to 643.19, 887.41 and 394.25

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Solution

The fourth proportional to 643.19, 887.41 and 394.25 is: 543.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.19 : 887.41 = 394.25 : x
  2. Step 2: Convert to fraction form
    643.19/887.41 = 394.25/x
  3. Step 3: Cross multiply
    643.19x = 887.41 × 394.25
  4. Step 4: Simplify right side
    643.19x = 349,861.39
  5. Step 5: Solve for x
    x = 349,861.39/643.19
  6. Step 6: Final answer
    x = 543.95

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