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Finding the Fourth Proportional to 379.94, 570.33 and 272.21

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Solution

The fourth proportional to 379.94, 570.33 and 272.21 is: 408.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.94 : 570.33 = 272.21 : x
  2. Step 2: Convert to fraction form
    379.94/570.33 = 272.21/x
  3. Step 3: Cross multiply
    379.94x = 570.33 × 272.21
  4. Step 4: Simplify right side
    379.94x = 155,249.53
  5. Step 5: Solve for x
    x = 155,249.53/379.94
  6. Step 6: Final answer
    x = 408.62

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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.