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Finding the Fourth Proportional to 419.49, 629.28 and 236.79

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Solution

The fourth proportional to 419.49, 629.28 and 236.79 is: 355.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.49 : 629.28 = 236.79 : x
  2. Step 2: Convert to fraction form
    419.49/629.28 = 236.79/x
  3. Step 3: Cross multiply
    419.49x = 629.28 × 236.79
  4. Step 4: Simplify right side
    419.49x = 149,007.21
  5. Step 5: Solve for x
    x = 149,007.21/419.49
  6. Step 6: Final answer
    x = 355.21

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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.