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Finding the Third Proportional to 21,891 and 31,879

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Solution

The third proportional to 21,891 and 31,879 is: 46,424.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891 : 31,879 = 31,879 : x
  2. Step 2: Convert to fraction form
    21,891/31,879 = 31,879/x
  3. Step 3: Cross multiply
    21,891x = 31,879 × 31,879
  4. Step 4: Simplify right side
    21,891x = 1,016,270,641
  5. Step 5: Solve for x
    x = 1,016,270,641/21,891
  6. Step 6: Final answer
    x = 46,424.13

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.