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Finding the Fourth Proportional to 419.49, 578.81 and 272.21

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Solution

The fourth proportional to 419.49, 578.81 and 272.21 is: 375.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.49 : 578.81 = 272.21 : x
  2. Step 2: Convert to fraction form
    419.49/578.81 = 272.21/x
  3. Step 3: Cross multiply
    419.49x = 578.81 × 272.21
  4. Step 4: Simplify right side
    419.49x = 157,555.66
  5. Step 5: Solve for x
    x = 157,555.66/419.49
  6. Step 6: Final answer
    x = 375.59

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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.