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Finding the Fourth Proportional to 417.54, 626.31 and 128.91

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Solution

The fourth proportional to 417.54, 626.31 and 128.91 is: 193.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.54 : 626.31 = 128.91 : x
  2. Step 2: Convert to fraction form
    417.54/626.31 = 128.91/x
  3. Step 3: Cross multiply
    417.54x = 626.31 × 128.91
  4. Step 4: Simplify right side
    417.54x = 80,737.62
  5. Step 5: Solve for x
    x = 80,737.62/417.54
  6. Step 6: Final answer
    x = 193.37

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