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Finding the Fourth Proportional to 543.91, 815.91 and 219.23

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Solution

The fourth proportional to 543.91, 815.91 and 219.23 is: 328.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.91 : 815.91 = 219.23 : x
  2. Step 2: Convert to fraction form
    543.91/815.91 = 219.23/x
  3. Step 3: Cross multiply
    543.91x = 815.91 × 219.23
  4. Step 4: Simplify right side
    543.91x = 178,871.95
  5. Step 5: Solve for x
    x = 178,871.95/543.91
  6. Step 6: Final answer
    x = 328.86

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