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Finding the Fourth Proportional to 379.15, 523.23 and 221.83

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Solution

The fourth proportional to 379.15, 523.23 and 221.83 is: 306.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.15 : 523.23 = 221.83 : x
  2. Step 2: Convert to fraction form
    379.15/523.23 = 221.83/x
  3. Step 3: Cross multiply
    379.15x = 523.23 × 221.83
  4. Step 4: Simplify right side
    379.15x = 116,068.11
  5. Step 5: Solve for x
    x = 116,068.11/379.15
  6. Step 6: Final answer
    x = 306.13

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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.