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Finding the Third Proportional to 1,991 and 4,482

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Solution

The third proportional to 1,991 and 4,482 is: 10,089.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 4,482 = 4,482 : x
  2. Step 2: Convert to fraction form
    1,991/4,482 = 4,482/x
  3. Step 3: Cross multiply
    1,991x = 4,482 × 4,482
  4. Step 4: Simplify right side
    1,991x = 20,088,324
  5. Step 5: Solve for x
    x = 20,088,324/1,991
  6. Step 6: Final answer
    x = 10,089.57

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Why These Related Problems?

These problems maintain the same ratio (2.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.