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Finding the Third Proportional to 18,763 and 40,990

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Solution

The third proportional to 18,763 and 40,990 is: 89,547.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,763 : 40,990 = 40,990 : x
  2. Step 2: Convert to fraction form
    18,763/40,990 = 40,990/x
  3. Step 3: Cross multiply
    18,763x = 40,990 × 40,990
  4. Step 4: Simplify right side
    18,763x = 1,680,180,100
  5. Step 5: Solve for x
    x = 1,680,180,100/18,763
  6. Step 6: Final answer
    x = 89,547.52

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.