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Finding the Fourth Proportional to 419.97, 629.94 and 127.46

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Solution

The fourth proportional to 419.97, 629.94 and 127.46 is: 191.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.97 : 629.94 = 127.46 : x
  2. Step 2: Convert to fraction form
    419.97/629.94 = 127.46/x
  3. Step 3: Cross multiply
    419.97x = 629.94 × 127.46
  4. Step 4: Simplify right side
    419.97x = 80,292.15
  5. Step 5: Solve for x
    x = 80,292.15/419.97
  6. Step 6: Final answer
    x = 191.19

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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.