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Finding the Third Proportional to 2,990 and 4,647

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Solution

The third proportional to 2,990 and 4,647 is: 7,222.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,990 : 4,647 = 4,647 : x
  2. Step 2: Convert to fraction form
    2,990/4,647 = 4,647/x
  3. Step 3: Cross multiply
    2,990x = 4,647 × 4,647
  4. Step 4: Simplify right side
    2,990x = 21,594,609
  5. Step 5: Solve for x
    x = 21,594,609/2,990
  6. Step 6: Final answer
    x = 7,222.28

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.