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Finding the Fourth Proportional to 419.88, 629.80 and 163.20

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Solution

The fourth proportional to 419.88, 629.80 and 163.20 is: 244.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.88 : 629.80 = 163.20 : x
  2. Step 2: Convert to fraction form
    419.88/629.80 = 163.20/x
  3. Step 3: Cross multiply
    419.88x = 629.80 × 163.20
  4. Step 4: Simplify right side
    419.88x = 102,783.36
  5. Step 5: Solve for x
    x = 102,783.36/419.88
  6. Step 6: Final answer
    x = 244.79

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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.