what is the next number in the sequence 1/2,1,2,4, =

The next is 8

If you multiply ½ x 2, the answer is 1

if you muliply 1 x 2, the answer is 2

if you multiply 2 x 2, the answer is 4

so, it seems that the next term in this sequaence is found by multiplying the preceding term by 2.

Knowing this, what is the next term?