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Finding the Third Proportional to 143.19 and 309.44

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Solution

The third proportional to 143.19 and 309.44 is: 668.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.19 : 309.44 = 309.44 : x
  2. Step 2: Convert to fraction form
    143.19/309.44 = 309.44/x
  3. Step 3: Cross multiply
    143.19x = 309.44 × 309.44
  4. Step 4: Simplify right side
    143.19x = 95,751.57
  5. Step 5: Solve for x
    x = 95,751.57/143.19
  6. Step 6: Final answer
    x = 668.71

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.