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Finding the Fourth Proportional to 381.24, 571.85 and 220.05

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Solution

The fourth proportional to 381.24, 571.85 and 220.05 is: 330.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.24 : 571.85 = 220.05 : x
  2. Step 2: Convert to fraction form
    381.24/571.85 = 220.05/x
  3. Step 3: Cross multiply
    381.24x = 571.85 × 220.05
  4. Step 4: Simplify right side
    381.24x = 125,834.49
  5. Step 5: Solve for x
    x = 125,834.49/381.24
  6. Step 6: Final answer
    x = 330.07

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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.