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Finding the Fourth Proportional to 307.28, 423.36 and 208.84

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Solution

The fourth proportional to 307.28, 423.36 and 208.84 is: 287.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.28 : 423.36 = 208.84 : x
  2. Step 2: Convert to fraction form
    307.28/423.36 = 208.84/x
  3. Step 3: Cross multiply
    307.28x = 423.36 × 208.84
  4. Step 4: Simplify right side
    307.28x = 88,414.50
  5. Step 5: Solve for x
    x = 88,414.50/307.28
  6. Step 6: Final answer
    x = 287.73

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