Net income for the quarter ending June 30, P&G's fourth fiscal quarter of 2015, was USD 521 million, down 79.8 percent from the year-ago period.
Revenues fell 9.2 percent to USD 17.79 billion, marking the sixth straight quarter of declining sales.
Chief financial officer Jon Moeller said the unpredictable foreign exchange market made it difficult to foresee when the company would turn around the trend of declining sales.
The maker of such household items as Crest toothpaste and Tide detergent, P&G has responded to the rising dollar by gradually implementing price increases in local currencies.
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"We still have probably a few soft quarters ahead of us," Moeller said on a conference call with reporters.
"But that should strengthen sequentially as we get through the year and hopefully be at a market growth rate by the end of the year."
The biggest factor in the earnings drop was a USD 2.1 billion charge to change P&G's accounting for its Venezuela operations following a series of foreign exchange policy changes in the South American country.
Net sales fell in all five business units, with the biggest drop in grooming at 18 percent.
The decline in grooming reflects lower demand for shaving equipment with the rise in popularity of beards and facial hair, a trend Moeller described as "primarily a US dynamic."
Moeller said demand for shaving gear is on the rise in many developing markets. P&G owns Gillette and Braun, both of which make razors.