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Finding the Fourth Proportional to 380.20, 571.22 and 243.51

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Solution

The fourth proportional to 380.20, 571.22 and 243.51 is: 365.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    380.20 : 571.22 = 243.51 : x
  2. Step 2: Convert to fraction form
    380.20/571.22 = 243.51/x
  3. Step 3: Cross multiply
    380.20x = 571.22 × 243.51
  4. Step 4: Simplify right side
    380.20x = 139,096.56
  5. Step 5: Solve for x
    x = 139,096.56/380.20
  6. Step 6: Final answer
    x = 365.85

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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.