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Finding the Fourth Proportional to 386.75, 534.20 and 288.95

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Solution

The fourth proportional to 386.75, 534.20 and 288.95 is: 399.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.75 : 534.20 = 288.95 : x
  2. Step 2: Convert to fraction form
    386.75/534.20 = 288.95/x
  3. Step 3: Cross multiply
    386.75x = 534.20 × 288.95
  4. Step 4: Simplify right side
    386.75x = 154,352.97
  5. Step 5: Solve for x
    x = 154,352.97/386.75
  6. Step 6: Final answer
    x = 399.10

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