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Finding the Third Proportional to 1,138 and 1,907

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Solution

The third proportional to 1,138 and 1,907 is: 3,195.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,138 : 1,907 = 1,907 : x
  2. Step 2: Convert to fraction form
    1,138/1,907 = 1,907/x
  3. Step 3: Cross multiply
    1,138x = 1,907 × 1,907
  4. Step 4: Simplify right side
    1,138x = 3,636,649
  5. Step 5: Solve for x
    x = 3,636,649/1,138
  6. Step 6: Final answer
    x = 3,195.65

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Why These Related Problems?

These problems maintain the same ratio (1.68) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.