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Finding the Fourth Proportional to 443.63, 665.45 and 199.87

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Solution

The fourth proportional to 443.63, 665.45 and 199.87 is: 299.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.63 : 665.45 = 199.87 : x
  2. Step 2: Convert to fraction form
    443.63/665.45 = 199.87/x
  3. Step 3: Cross multiply
    443.63x = 665.45 × 199.87
  4. Step 4: Simplify right side
    443.63x = 133,004.66
  5. Step 5: Solve for x
    x = 133,004.66/443.63
  6. Step 6: Final answer
    x = 299.81

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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.