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Finding the Fourth Proportional to 318.53, 475.20 and 309.71

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Solution

The fourth proportional to 318.53, 475.20 and 309.71 is: 462.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.53 : 475.20 = 309.71 : x
  2. Step 2: Convert to fraction form
    318.53/475.20 = 309.71/x
  3. Step 3: Cross multiply
    318.53x = 475.20 × 309.71
  4. Step 4: Simplify right side
    318.53x = 147,172.64
  5. Step 5: Solve for x
    x = 147,172.64/318.53
  6. Step 6: Final answer
    x = 462.04

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