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Finding the Fourth Proportional to 521.82, 720.12 and 288.95

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Solution

The fourth proportional to 521.82, 720.12 and 288.95 is: 398.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.82 : 720.12 = 288.95 : x
  2. Step 2: Convert to fraction form
    521.82/720.12 = 288.95/x
  3. Step 3: Cross multiply
    521.82x = 720.12 × 288.95
  4. Step 4: Simplify right side
    521.82x = 208,078.67
  5. Step 5: Solve for x
    x = 208,078.67/521.82
  6. Step 6: Final answer
    x = 398.76

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