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Finding the Fourth Proportional to 381.45, 572.21 and 121.47

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Solution

The fourth proportional to 381.45, 572.21 and 121.47 is: 182.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.45 : 572.21 = 121.47 : x
  2. Step 2: Convert to fraction form
    381.45/572.21 = 121.47/x
  3. Step 3: Cross multiply
    381.45x = 572.21 × 121.47
  4. Step 4: Simplify right side
    381.45x = 69,506.20
  5. Step 5: Solve for x
    x = 69,506.20/381.45
  6. Step 6: Final answer
    x = 182.22

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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.