vector - moving my object with transform.Translate make it move in wrong way -

i'm having hard time unity trying translate simple object. object move in 3 dimension world on x , z axis. function i'm using translate function of transform of gameobject. x , z position i'm trying move object.

transform.translate (( new vector3(x - transform.position.x ,0,z - transform.position.z)).normalized * time.deltatime  * speed,space.world); 

so here's problem i'm dealing : if result of calcul following vector : (0,0,-1.0), object move in wrong direction.

example :

starting position (25.16, 1.0, 12.0) final position after translate function : (25.6, 1.0, 12.1)

any appeciate me understand this.

i'm using script in 1 of projects move gameobject point, attach on game object , enter x , y in finpos.

using unityengine;      public class movementanimation : monobehaviour     {           public vector3 finpos;         public bool loop = true;         public int speed = 1;          private vector3 startpos;         private float starttime;         private float lenght;          void start ()         {             startpos = this.transform.position;             starttime = time.time;             lenght = vector3.distance(startpos, finpos);         }          void update ()         {             if (this.transform.position == finpos)             {                 if (loop)                 {                     this.transform.position = startpos;                     starttime = time.time;                 }             }             else             {                 float distance = (time.time - starttime) * speed;                 this.transform.position = vector3.lerp(startpos, finpos, distance / lenght);             }         }     }