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Finding the Third Proportional to 1,115 and 1,851

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Solution

The third proportional to 1,115 and 1,851 is: 3,072.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,115 : 1,851 = 1,851 : x
  2. Step 2: Convert to fraction form
    1,115/1,851 = 1,851/x
  3. Step 3: Cross multiply
    1,115x = 1,851 × 1,851
  4. Step 4: Simplify right side
    1,115x = 3,426,201
  5. Step 5: Solve for x
    x = 3,426,201/1,115
  6. Step 6: Final answer
    x = 3,072.83

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.