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Finding the Fourth Proportional to 530, 731.09 and 308.90

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Solution

The fourth proportional to 530, 731.09 and 308.90 is: 426.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    530 : 731.09 = 308.90 : x
  2. Step 2: Convert to fraction form
    530/731.09 = 308.90/x
  3. Step 3: Cross multiply
    530x = 731.09 × 308.90
  4. Step 4: Simplify right side
    530x = 225,833.70
  5. Step 5: Solve for x
    x = 225,833.70/530
  6. Step 6: Final answer
    x = 426.10

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