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Finding the Fourth Proportional to 379.17, 523.17 and 221.76

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Solution

The fourth proportional to 379.17, 523.17 and 221.76 is: 305.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.17 : 523.17 = 221.76 : x
  2. Step 2: Convert to fraction form
    379.17/523.17 = 221.76/x
  3. Step 3: Cross multiply
    379.17x = 523.17 × 221.76
  4. Step 4: Simplify right side
    379.17x = 116,018.18
  5. Step 5: Solve for x
    x = 116,018.18/379.17
  6. Step 6: Final answer
    x = 305.98

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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.