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Finding the Fourth Proportional to 379.05, 523.02 and 221.69

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Solution

The fourth proportional to 379.05, 523.02 and 221.69 is: 305.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.05 : 523.02 = 221.69 : x
  2. Step 2: Convert to fraction form
    379.05/523.02 = 221.69/x
  3. Step 3: Cross multiply
    379.05x = 523.02 × 221.69
  4. Step 4: Simplify right side
    379.05x = 115,948.30
  5. Step 5: Solve for x
    x = 115,948.30/379.05
  6. Step 6: Final answer
    x = 305.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.