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Finding the Fourth Proportional to 429.75, 644.64 and 141.21

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Solution

The fourth proportional to 429.75, 644.64 and 141.21 is: 211.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.75 : 644.64 = 141.21 : x
  2. Step 2: Convert to fraction form
    429.75/644.64 = 141.21/x
  3. Step 3: Cross multiply
    429.75x = 644.64 × 141.21
  4. Step 4: Simplify right side
    429.75x = 91,029.61
  5. Step 5: Solve for x
    x = 91,029.61/429.75
  6. Step 6: Final answer
    x = 211.82

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