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Finding the Fourth Proportional to 669.70, 1,004.90 and 449.79

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Solution

The fourth proportional to 669.70, 1,004.90 and 449.79 is: 674.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.70 : 1,004.90 = 449.79 : x
  2. Step 2: Convert to fraction form
    669.70/1,004.90 = 449.79/x
  3. Step 3: Cross multiply
    669.70x = 1,004.90 × 449.79
  4. Step 4: Simplify right side
    669.70x = 451,993.97
  5. Step 5: Solve for x
    x = 451,993.97/669.70
  6. Step 6: Final answer
    x = 674.92

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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.