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Finding the Third Proportional to 291.38 and 447.19

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Solution

The third proportional to 291.38 and 447.19 is: 686.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.38 : 447.19 = 447.19 : x
  2. Step 2: Convert to fraction form
    291.38/447.19 = 447.19/x
  3. Step 3: Cross multiply
    291.38x = 447.19 × 447.19
  4. Step 4: Simplify right side
    291.38x = 199,976.66
  5. Step 5: Solve for x
    x = 199,976.66/291.38
  6. Step 6: Final answer
    x = 686.32

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.