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A bigger move would boost lending against the World Bank's "callable capital," a cushion of emergency funds pledged by shareholders but not paid-in, but this would require some countries to change laws.

But he said the bank's resources, even with moves to stretch its balance sheet, are woefully inadequate, with paid-in capital of just $22.6 billion for the World Bank's International Bank for Reconstruction and Development over its 78-year history.

The bank is also examining other ways to expand lending, including providing more loan guarantees, lending against callable capital that is pledged but not paid-in, and special bonds that can serve as hybrid capital.

She will seek to build G20 support for an "equi-proportional" increase in IMF quota funds paid-in by member countries, which would increase IMF lending resources, but not immediately change its shareholding structure.

Yellen said in prepared remarks at a news conference in New Delhi that she will seek to build G20 support for an "equi-proportional" increase in IMF quota funds paid-in by member countries, which would increase IMF lending resources, but not immediately change its shareholding structure.