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Finding the Fourth Proportional to 419.89, 629.43 and 338.26

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Solution

The fourth proportional to 419.89, 629.43 and 338.26 is: 507.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.89 : 629.43 = 338.26 : x
  2. Step 2: Convert to fraction form
    419.89/629.43 = 338.26/x
  3. Step 3: Cross multiply
    419.89x = 629.43 × 338.26
  4. Step 4: Simplify right side
    419.89x = 212,910.99
  5. Step 5: Solve for x
    x = 212,910.99/419.89
  6. Step 6: Final answer
    x = 507.06

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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.