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Finding the Fourth Proportional to 419.70, 578.97 and 272.42

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Solution

The fourth proportional to 419.70, 578.97 and 272.42 is: 375.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.70 : 578.97 = 272.42 : x
  2. Step 2: Convert to fraction form
    419.70/578.97 = 272.42/x
  3. Step 3: Cross multiply
    419.70x = 578.97 × 272.42
  4. Step 4: Simplify right side
    419.70x = 157,720.11
  5. Step 5: Solve for x
    x = 157,720.11/419.70
  6. Step 6: Final answer
    x = 375.79

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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.