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Finding the Fourth Proportional to 381.70, 571.83 and 266.23

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Solution

The fourth proportional to 381.70, 571.83 and 266.23 is: 398.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    381.70 : 571.83 = 266.23 : x
  2. Step 2: Convert to fraction form
    381.70/571.83 = 266.23/x
  3. Step 3: Cross multiply
    381.70x = 571.83 × 266.23
  4. Step 4: Simplify right side
    381.70x = 152,238.30
  5. Step 5: Solve for x
    x = 152,238.30/381.70
  6. Step 6: Final answer
    x = 398.84

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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.