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Finding the Fourth Proportional to 832.75, 1,249.09 and 393.86

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Solution

The fourth proportional to 832.75, 1,249.09 and 393.86 is: 590.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    832.75 : 1,249.09 = 393.86 : x
  2. Step 2: Convert to fraction form
    832.75/1,249.09 = 393.86/x
  3. Step 3: Cross multiply
    832.75x = 1,249.09 × 393.86
  4. Step 4: Simplify right side
    832.75x = 491,968.73
  5. Step 5: Solve for x
    x = 491,968.73/832.75
  6. Step 6: Final answer
    x = 590.78

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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.