Let $ABCD$ be a convex quadrilateral, and let $G_A,$ $G_B,$ $G_C,$ $G_D$ denote the centroids of triangles $BCD,$ $ACD,$ $ABD,$ and $ABC,$ respectively.  Find $\frac{[G_A G_B G_C G_D]}{[ABCD]}.$

[asy]
unitsize(0.6 cm);

pair A, B, C, D;
pair[] G;

A = (0,0);
B = (7,1);
C = (5,-5);
D = (1,-3);
G[1] = (B + C + D)/3;
G[2] = (A + C + D)/3;
G[3] = (A + B + D)/3;
G[4] = (A + B + C)/3;

draw(A--B--C--D--cycle);
draw(G[1]--G[2]--G[3]--G[4]--cycle,red);

label("$A$", A, W);
label("$B$", B, NE);
label("$C$", C, SE);
label("$D$", D, SW);
dot("$G_A$", G[1], SE);
dot("$G_B$", G[2], W);
dot("$G_C$", G[3], NW);
dot("$G_D$", G[4], NE);
[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Let $ABCD$ be a convex quadrilateral, and let $G_A,$ $G_B,$ $G_C,$ $G_D$ denote the centroids of triangles $BCD,$ $ACD,$ $ABD,$ and $ABC,$ respectively.  Find $\frac{[G_A G_B G_C G_D]}{[ABCD]}.$

[asy]
unitsize(0.6 cm);

pair A, B, C, D;
pair[] G;

A = (0,0);
B = (7,1);
C = (5,-5);
D = (1,-3);
G[1] = (B + C + D)/3;
G[2] = (A + C + D)/3;
G[3] = (A + B + D)/3;
G[4] = (A + B + C)/3;

draw(A--B--C--D--cycle);
draw(G[1]--G[2]--G[3]--G[4]--cycle,red);

label("$A$", A, W);
label("$B$", B, NE);
label("$C$", C, SE);
label("$D$", D, SW);
dot("$G_A$", G[1], SE);
dot("$G_B$", G[2], W);
dot("$G_C$", G[3], NW);
dot("$G_D$", G[4], NE);
[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
\frac{1}{9}
Let $ABCD$ be a convex quadrilateral, and let $G_A,$ $G_B,$ $G_C,$ $G_D$ denote the centroids of triangles $BCD,$ $ACD,$ $ABD,$ and $ABC,$ respectively.  Find $\frac{[G_A G_B G_C G_D]}{[ABCD]}.$

[asy]
unitsize(0.6 cm);

pair A, B, C, D;
pair[] G;

A = (0,0);
B = (7,1);
C = (5,-5);
D = (1,-3);
G[1] = (B + C + D)/3;
G[2] = (A + C + D)/3;
G[3] = (A + B + D)/3;
G[4] = (A + B + C)/3;

draw(A--B--C--D--cycle);
draw(G[1]--G[2]--G[3]--G[4]--cycle,red);

label("$A$", A, W);
label("$B$", B, NE);
label("$C$", C, SE);
label("$D$", D, SW);
dot("$G_A$", G[1], SE);
dot("$G_B$", G[2], W);
dot("$G_C$", G[3], NW);
dot("$G_D$", G[4], NE);
[/asy]
train