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Finding the Fourth Proportional to 829.68, 1,245.24 and 396.96

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Solution

The fourth proportional to 829.68, 1,245.24 and 396.96 is: 595.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    829.68 : 1,245.24 = 396.96 : x
  2. Step 2: Convert to fraction form
    829.68/1,245.24 = 396.96/x
  3. Step 3: Cross multiply
    829.68x = 1,245.24 × 396.96
  4. Step 4: Simplify right side
    829.68x = 494,310.47
  5. Step 5: Solve for x
    x = 494,310.47/829.68
  6. Step 6: Final answer
    x = 595.78

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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.