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Finding the Fourth Proportional to 419.72, 629.55 and 214.43

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Solution

The fourth proportional to 419.72, 629.55 and 214.43 is: 321.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.72 : 629.55 = 214.43 : x
  2. Step 2: Convert to fraction form
    419.72/629.55 = 214.43/x
  3. Step 3: Cross multiply
    419.72x = 629.55 × 214.43
  4. Step 4: Simplify right side
    419.72x = 134,991.26
  5. Step 5: Solve for x
    x = 134,991.26/419.72
  6. Step 6: Final answer
    x = 321.63

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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.