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Finding the Fourth Proportional to 792.69, 1,188.09 and 445.61

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Solution

The fourth proportional to 792.69, 1,188.09 and 445.61 is: 667.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    792.69 : 1,188.09 = 445.61 : x
  2. Step 2: Convert to fraction form
    792.69/1,188.09 = 445.61/x
  3. Step 3: Cross multiply
    792.69x = 1,188.09 × 445.61
  4. Step 4: Simplify right side
    792.69x = 529,418.84
  5. Step 5: Solve for x
    x = 529,418.84/792.69
  6. Step 6: Final answer
    x = 667.88

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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.