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Finding the Third Proportional to 1,991 and 4,030

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Solution

The third proportional to 1,991 and 4,030 is: 8,157.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 4,030 = 4,030 : x
  2. Step 2: Convert to fraction form
    1,991/4,030 = 4,030/x
  3. Step 3: Cross multiply
    1,991x = 4,030 × 4,030
  4. Step 4: Simplify right side
    1,991x = 16,240,900
  5. Step 5: Solve for x
    x = 16,240,900/1,991
  6. Step 6: Final answer
    x = 8,157.16

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Why These Related Problems?

These problems maintain the same ratio (2.02) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.