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Finding the Fourth Proportional to 663.02, 915.28 and 397.59

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Solution

The fourth proportional to 663.02, 915.28 and 397.59 is: 548.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    663.02 : 915.28 = 397.59 : x
  2. Step 2: Convert to fraction form
    663.02/915.28 = 397.59/x
  3. Step 3: Cross multiply
    663.02x = 915.28 × 397.59
  4. Step 4: Simplify right side
    663.02x = 363,906.18
  5. Step 5: Solve for x
    x = 363,906.18/663.02
  6. Step 6: Final answer
    x = 548.86

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