That is an ungodly like/dislike ratio which isn't even possible naturally IMO. Even if your article was about how you like to drink piss for the vitamins in there it would have a more favorable ratio.
To answer your question though, it would be on the site to weed them out which comes down to security measures.
A couple security measures that could help with that:
1. Strict 1 vote per 1 IP address
2. Not accepting comments/votes from VPN's or other proxy IPs.
At the end of the day, the majority of people who spam in any capacity whether its votes, comments, creating fake profiles.... rely on cheap proxies to get the job done. Or loopholes like being able to use the same IP over and over again on the same article vote.
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