Are these equivalent?

Answer:
No
Step-by-step explanation:
The numerators must be multiplied by 2 to be equal, meanwhile the denominators must be multiplied by 44/21 to be equal.
Examples: 2.8/4.4 would be equivalent to 1.4/2.2. In turn, 1.4/2.1 would be equivalent to 2.8/4.2.