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Finding the Fourth Proportional to 521.78, 720.06 and 288.92

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Solution

The fourth proportional to 521.78, 720.06 and 288.92 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    521.78 : 720.06 = 288.92 : x
  2. Step 2: Convert to fraction form
    521.78/720.06 = 288.92/x
  3. Step 3: Cross multiply
    521.78x = 720.06 × 288.92
  4. Step 4: Simplify right side
    521.78x = 208,039.74
  5. Step 5: Solve for x
    x = 208,039.74/521.78
  6. Step 6: Final answer
    x = 398.71

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