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Finding the Third Proportional to 289.75 and 449.19

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Solution

The third proportional to 289.75 and 449.19 is: 696.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    289.75 : 449.19 = 449.19 : x
  2. Step 2: Convert to fraction form
    289.75/449.19 = 449.19/x
  3. Step 3: Cross multiply
    289.75x = 449.19 × 449.19
  4. Step 4: Simplify right side
    289.75x = 201,769.41
  5. Step 5: Solve for x
    x = 201,769.41/289.75
  6. Step 6: Final answer
    x = 696.36

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.