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Finding the Fourth Proportional to 381.11, 571.66 and 320.05

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Solution

The fourth proportional to 381.11, 571.66 and 320.05 is: 480.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.11 : 571.66 = 320.05 : x
  2. Step 2: Convert to fraction form
    381.11/571.66 = 320.05/x
  3. Step 3: Cross multiply
    381.11x = 571.66 × 320.05
  4. Step 4: Simplify right side
    381.11x = 182,959.70
  5. Step 5: Solve for x
    x = 182,959.70/381.11
  6. Step 6: Final answer
    x = 480.08

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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.