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Finding the Fourth Proportional to 380.91, 571.28 and 149.72

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Solution

The fourth proportional to 380.91, 571.28 and 149.72 is: 224.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.91 : 571.28 = 149.72 : x
  2. Step 2: Convert to fraction form
    380.91/571.28 = 149.72/x
  3. Step 3: Cross multiply
    380.91x = 571.28 × 149.72
  4. Step 4: Simplify right side
    380.91x = 85,528.44
  5. Step 5: Solve for x
    x = 85,528.44/380.91
  6. Step 6: Final answer
    x = 224.54

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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.