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Finding the Fourth Proportional to 386.40, 578.24 and 263.84

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Solution

The fourth proportional to 386.40, 578.24 and 263.84 is: 394.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.40 : 578.24 = 263.84 : x
  2. Step 2: Convert to fraction form
    386.40/578.24 = 263.84/x
  3. Step 3: Cross multiply
    386.40x = 578.24 × 263.84
  4. Step 4: Simplify right side
    386.40x = 152,562.84
  5. Step 5: Solve for x
    x = 152,562.84/386.40
  6. Step 6: Final answer
    x = 394.83

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