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Finding the Fourth Proportional to 389.20, 583.18 and 379.64

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Solution

The fourth proportional to 389.20, 583.18 and 379.64 is: 568.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    389.20 : 583.18 = 379.64 : x
  2. Step 2: Convert to fraction form
    389.20/583.18 = 379.64/x
  3. Step 3: Cross multiply
    389.20x = 583.18 × 379.64
  4. Step 4: Simplify right side
    389.20x = 221,398.46
  5. Step 5: Solve for x
    x = 221,398.46/389.20
  6. Step 6: Final answer
    x = 568.86

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