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Finding the Fourth Proportional to 419.72, 629.58 and 163.28

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Solution

The fourth proportional to 419.72, 629.58 and 163.28 is: 244.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.72 : 629.58 = 163.28 : x
  2. Step 2: Convert to fraction form
    419.72/629.58 = 163.28/x
  3. Step 3: Cross multiply
    419.72x = 629.58 × 163.28
  4. Step 4: Simplify right side
    419.72x = 102,797.82
  5. Step 5: Solve for x
    x = 102,797.82/419.72
  6. Step 6: Final answer
    x = 244.92

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.