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Finding the Fourth Proportional to 518.91, 778.47 and 288.13

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Solution

The fourth proportional to 518.91, 778.47 and 288.13 is: 432.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.91 : 778.47 = 288.13 : x
  2. Step 2: Convert to fraction form
    518.91/778.47 = 288.13/x
  3. Step 3: Cross multiply
    518.91x = 778.47 × 288.13
  4. Step 4: Simplify right side
    518.91x = 224,300.56
  5. Step 5: Solve for x
    x = 224,300.56/518.91
  6. Step 6: Final answer
    x = 432.25

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