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Finding the Fourth Proportional to 443.62, 665.43 and 211.81

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Solution

The fourth proportional to 443.62, 665.43 and 211.81 is: 317.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.62 : 665.43 = 211.81 : x
  2. Step 2: Convert to fraction form
    443.62/665.43 = 211.81/x
  3. Step 3: Cross multiply
    443.62x = 665.43 × 211.81
  4. Step 4: Simplify right side
    443.62x = 140,942.84
  5. Step 5: Solve for x
    x = 140,942.84/443.62
  6. Step 6: Final answer
    x = 317.71

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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.