If a,b,c are in AP and a^2,b^2,c^2 are in gp such that a<b<c and a+b+c=3/4 .Find value of a

Question

I get the value of a as 1/4 but thats incorrect

Answer 1

b = a + d

c = a + 2d

a + a + d + a + 2d = 0.75

3a + 3d = 0.75

a + d = 0.25

b = 0.25

a + c = 0.5

 

Must stop here, three variables and only one equation. Incomplete system.