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Finding the Third Proportional to 821 and 1,807

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Solution

The third proportional to 821 and 1,807 is: 3,977.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    821 : 1,807 = 1,807 : x
  2. Step 2: Convert to fraction form
    821/1,807 = 1,807/x
  3. Step 3: Cross multiply
    821x = 1,807 × 1,807
  4. Step 4: Simplify right side
    821x = 3,265,249
  5. Step 5: Solve for x
    x = 3,265,249/821
  6. Step 6: Final answer
    x = 3,977.16

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.