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Finding the Fourth Proportional to 381.72, 572.36 and 121.67

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Solution

The fourth proportional to 381.72, 572.36 and 121.67 is: 182.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.72 : 572.36 = 121.67 : x
  2. Step 2: Convert to fraction form
    381.72/572.36 = 121.67/x
  3. Step 3: Cross multiply
    381.72x = 572.36 × 121.67
  4. Step 4: Simplify right side
    381.72x = 69,639.04
  5. Step 5: Solve for x
    x = 69,639.04/381.72
  6. Step 6: Final answer
    x = 182.43

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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.