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Finding the Fourth Proportional to 453.02, 679.42 and 128.30

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Solution

The fourth proportional to 453.02, 679.42 and 128.30 is: 192.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    453.02 : 679.42 = 128.30 : x
  2. Step 2: Convert to fraction form
    453.02/679.42 = 128.30/x
  3. Step 3: Cross multiply
    453.02x = 679.42 × 128.30
  4. Step 4: Simplify right side
    453.02x = 87,169.59
  5. Step 5: Solve for x
    x = 87,169.59/453.02
  6. Step 6: Final answer
    x = 192.42

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