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Finding the Third Proportional to 21,138 and 49,989

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Solution

The third proportional to 21,138 and 49,989 is: 118,218.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,138 : 49,989 = 49,989 : x
  2. Step 2: Convert to fraction form
    21,138/49,989 = 49,989/x
  3. Step 3: Cross multiply
    21,138x = 49,989 × 49,989
  4. Step 4: Simplify right side
    21,138x = 2,498,900,121
  5. Step 5: Solve for x
    x = 2,498,900,121/21,138
  6. Step 6: Final answer
    x = 118,218.38

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.