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Finding the Fourth Proportional to 419.75, 579.21 and 272.12

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Solution

The fourth proportional to 419.75, 579.21 and 272.12 is: 375.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.75 : 579.21 = 272.12 : x
  2. Step 2: Convert to fraction form
    419.75/579.21 = 272.12/x
  3. Step 3: Cross multiply
    419.75x = 579.21 × 272.12
  4. Step 4: Simplify right side
    419.75x = 157,611.73
  5. Step 5: Solve for x
    x = 157,611.73/419.75
  6. Step 6: Final answer
    x = 375.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.