Even until nowBangladesh won the first match by seven wickets and the second by 160 runs — both in Khulna. The West Indies levelled the series with a four wicket win in the third and 75 runs in the fourth.
Both teams will now play a Twenty20 international in Dhaka on Monday.
It was Mahmudullah and captain Mushfiqur Rahim (44) who set the home team on the victory path through their 91-run stand for the fourth wicket after paceman Kemar Roach (5-56) had derailed them in early overs.
Brief scores: West Indies 217 (K Pollard 85, Mahmudullah 2/38) vs Bangladesh 221/8 in 44 overs (Mahmudullah 48, K Roach 5/56)