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Finding the Third Proportional to 4,990 and 8,281

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Solution

The third proportional to 4,990 and 8,281 is: 13,742.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,990 : 8,281 = 8,281 : x
  2. Step 2: Convert to fraction form
    4,990/8,281 = 8,281/x
  3. Step 3: Cross multiply
    4,990x = 8,281 × 8,281
  4. Step 4: Simplify right side
    4,990x = 68,574,961
  5. Step 5: Solve for x
    x = 68,574,961/4,990
  6. Step 6: Final answer
    x = 13,742.48

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Why These Related Problems?

These problems maintain the same ratio (1.66) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.