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Finding the Fourth Proportional to 487.64, 731.48 and 213.73

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Solution

The fourth proportional to 487.64, 731.48 and 213.73 is: 320.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.64 : 731.48 = 213.73 : x
  2. Step 2: Convert to fraction form
    487.64/731.48 = 213.73/x
  3. Step 3: Cross multiply
    487.64x = 731.48 × 213.73
  4. Step 4: Simplify right side
    487.64x = 156,339.58
  5. Step 5: Solve for x
    x = 156,339.58/487.64
  6. Step 6: Final answer
    x = 320.61

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