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Finding the Fourth Proportional to 379.12, 523.06 and 221.68

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Solution

The fourth proportional to 379.12, 523.06 and 221.68 is: 305.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.12 : 523.06 = 221.68 : x
  2. Step 2: Convert to fraction form
    379.12/523.06 = 221.68/x
  3. Step 3: Cross multiply
    379.12x = 523.06 × 221.68
  4. Step 4: Simplify right side
    379.12x = 115,951.94
  5. Step 5: Solve for x
    x = 115,951.94/379.12
  6. Step 6: Final answer
    x = 305.84

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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.