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Finding the Fourth Proportional to 325.04, 487.70 and 142.39

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Solution

The fourth proportional to 325.04, 487.70 and 142.39 is: 213.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.04 : 487.70 = 142.39 : x
  2. Step 2: Convert to fraction form
    325.04/487.70 = 142.39/x
  3. Step 3: Cross multiply
    325.04x = 487.70 × 142.39
  4. Step 4: Simplify right side
    325.04x = 69,440.45
  5. Step 5: Solve for x
    x = 69,440.45/325.04
  6. Step 6: Final answer
    x = 213.64

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