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Finding the Fourth Proportional to 443.10, 664.64 and 199.45

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Solution

The fourth proportional to 443.10, 664.64 and 199.45 is: 299.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.10 : 664.64 = 199.45 : x
  2. Step 2: Convert to fraction form
    443.10/664.64 = 199.45/x
  3. Step 3: Cross multiply
    443.10x = 664.64 × 199.45
  4. Step 4: Simplify right side
    443.10x = 132,562.70
  5. Step 5: Solve for x
    x = 132,562.70/443.10
  6. Step 6: Final answer
    x = 299.17

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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.