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Finding the Fourth Proportional to 402.74, 604.23 and 128.82

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Solution

The fourth proportional to 402.74, 604.23 and 128.82 is: 193.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    402.74 : 604.23 = 128.82 : x
  2. Step 2: Convert to fraction form
    402.74/604.23 = 128.82/x
  3. Step 3: Cross multiply
    402.74x = 604.23 × 128.82
  4. Step 4: Simplify right side
    402.74x = 77,838.69
  5. Step 5: Solve for x
    x = 77,838.69/402.74
  6. Step 6: Final answer
    x = 193.27

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