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Well it is known that:
Vp/Vs = Np/Ns
Is/Ip = Np/Ns
Then Vp/Vs * Is/Ip = (Np/Ns) * (Np/Ns) = (Np/Ns)^2
(Vp*Is)/(Vs*Ip) = (Np/Ns)^2
Vp/Ip * Is/Vs = (Np/Ns)^2
Rp *1/Rs = (Np/Ns)^2
Rp/Rs = (Np/Ns)^2
1/16 = (Np/Ns)^2
Np/Ns =1/4
from the formula for turns ratio of transformer R1/R2= (T1/T2)2
therefore turns ratio will be1/256.