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Finding the Fourth Proportional to 396,620.64, 547,321.53 and 215,328.65

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Solution

The fourth proportional to 396,620.64, 547,321.53 and 215,328.65 is: 297,145.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    396,620.64 : 547,321.53 = 215,328.65 : x
  2. Step 2: Convert to fraction form
    396,620.64/547,321.53 = 215,328.65/x
  3. Step 3: Cross multiply
    396,620.64x = 547,321.53 × 215,328.65
  4. Step 4: Simplify right side
    396,620.64x = 117,854,004,241.71
  5. Step 5: Solve for x
    x = 117,854,004,241.71/396,620.64
  6. Step 6: Final answer
    x = 297,145.41

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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.