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Finding the Fourth Proportional to 390.06, 538.61 and 323.61

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Solution

The fourth proportional to 390.06, 538.61 and 323.61 is: 446.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    390.06 : 538.61 = 323.61 : x
  2. Step 2: Convert to fraction form
    390.06/538.61 = 323.61/x
  3. Step 3: Cross multiply
    390.06x = 538.61 × 323.61
  4. Step 4: Simplify right side
    390.06x = 174,299.58
  5. Step 5: Solve for x
    x = 174,299.58/390.06
  6. Step 6: Final answer
    x = 446.85

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