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Finding the Fourth Proportional to 543.11, 815.21 and 299.75

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Solution

The fourth proportional to 543.11, 815.21 and 299.75 is: 449.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    543.11 : 815.21 = 299.75 : x
  2. Step 2: Convert to fraction form
    543.11/815.21 = 299.75/x
  3. Step 3: Cross multiply
    543.11x = 815.21 × 299.75
  4. Step 4: Simplify right side
    543.11x = 244,361.98
  5. Step 5: Solve for x
    x = 244,361.98/543.11
  6. Step 6: Final answer
    x = 449.93

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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.