George Osborne has said talks with key allies underlined the "real appetite" for the sort of European Union reforms needed to keep the UK in the bloc.
The Chancellor spent the day in Helsinki, Stockholm and Copenhagen seeking to build support for the UK's demands for a new settlement in Brussels.
He held what the Treasury called "constructive" talks with Finland's Finance Minister Alexander Stubb and Foreign Minister Timo Soini, Sweden's Prime Minister Stefan Lofven and Finance Minister Magdalena Andersson, and Denmark's Prime Minister Lars Lokke Rasmussen and Finance Minister Claus Hjort Frederiksen.
Mr Stubb said afterwards that it would be a "travesty" if the UK was to vote to leave and that the EU could not exist without it.
David Cameron has promised to renegotiate the UK's relationship with the EU ahead of an in/out referendum and talks have begun between British officials and counterparts in Brussels.
The Prime Minister wants any deal to ensure national parliaments retain power and stop welfare incentives from attracting people to the country from across Europe.
Mr Osborne's talks focused on expanding trade with burgeoning economies as well as protecting the rights of non-eurozone countries as the single currency block continues to integrate further.
Ms Andersson said it was "very important" to prevent a so-called "Brexit" and her country would engage constructively with renegotiations.
"Finland, Sweden and Denmark are countries with whom we see eye to eye on how you make the EU better for all its citizens. We want an EU that is better for everyone, not just Britain, and we all want better opportunities for our citizens and better prosperity for all of our economies," Mr Osborne said.
"Today's discussions were very, very positive and showed to me that there is a real appetite to reform the European Union.
"I want the UK to be part of a reformed European Union - one that creates jobs and drives growth - but for that to happen the EU needs to instigate changes that will benefit the whole of Europe. The results of our renegotiation will be put to the British people in a referendum and they will decide."
Mr Stubb said: "Our take is very simple. Without the United Kingdom there is no European Union. So I think one of the key issues over the next two years is to work towards a solution which allows for the possibility for the UK to continue as a steadfast and central member of the European Union.
"There's a lot of common work and a lot of common ground and I think it would be a travesty for both Europe and the UK, where the UK were to leave Europe."
Ms Andersson said: "For Sweden, keeping Britain within the European Union is very important. It is a close ally to Sweden but of course the European Union it would be different without Britain. I think the European Union is a better union for Britain being in the European Union and of course also as a non-Euro country, it's a good thing having another large country that is also non-Euro.
"For us it is important to have Britain within the European Union and we will of course engage constructively in those discussions that will be coming in that period."
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