The International Monetary Fund (IMF) has approved just over three billion euro (£2.6bn) to Greece in the latest instalment of a rescue package aimed at helping the country pull back from an impending debt default.
The move by the executive board had been expected after a decision last week by eurozone finance ministers to give Greece their portion of a 12 billion euro (£10.6bn) loan payment that is part of a 110 billion euro (£97.7bn) package agreed last year.
Friday's IMF action, with new managing director Christine Lagarde in the chair, came as European banks, insurance companies and other financial institutions were trying to get the private sector involved in helping save Greece from default.
The 17 countries that use the euro will continue with the IMF to prop up Greece's struggling economy in the coming years with a second package of aid loans to be completed in September.
Ms Lagarde said the raft of reforms, spending cuts and tax increases the government had been carrying out as part of conditions to receive bailout funds "is delivering important results: the deficit is being reduced, the economy is rebalancing and competitiveness is gradually improving".
But she said Greece still faced significant challenges, including meeting a target of getting its burdensome debt down to 7.5% of gross domestic product in 2011 and to less than 3% by 2014.
Ms Lagarde said: "Greece's debt sustainability hinges critically on timely and vigorous implementation of the adjustment programme with no margin for slippage, and continued support from European partners and private sector involvement."
She said the government's privatisation strategy was a critical step towards boosting investment and reducing the debt burden.
The European Union and the IMF Fund had said they would refuse to pay out the next instalment unless Greek MPs approved a new five-year package of 28 billion euros (£24.8bn) worth of spending cuts and tax increases and a 50 billion euro (£44.4bn) privatisation plan before the end of June.
Greek MPs delivered what was asked of them, cheering up global financial markets, but provoking violent demonstrations in the streets of Athens.