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Finding the Fourth Proportional to 396,505.56, 547,163.02 and 215,213.64

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Solution

The fourth proportional to 396,505.56, 547,163.02 and 215,213.64 is: 296,986.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,505.56 : 547,163.02 = 215,213.64 : x
  2. Step 2: Convert to fraction form
    396,505.56/547,163.02 = 215,213.64/x
  3. Step 3: Cross multiply
    396,505.56x = 547,163.02 × 215,213.64
  4. Step 4: Simplify right side
    396,505.56x = 117,756,945,207.59
  5. Step 5: Solve for x
    x = 117,756,945,207.59/396,505.56
  6. Step 6: Final answer
    x = 296,986.87

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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.