c# - Matrix.CreateScale only scaling with full numbers -

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i've been trying zoom in , out on objects using matrix.createscale() function, using this: 

matrix.createscale(new vector3(zoom, zoom, 0))

but, i've noticed when tried make zoom 1,5 doesn't anything, @ numbers 1 or 2, when reaches it's big/small, how zoom in , out without taking such big steps, how make take less steps?

   public float zoom     {         { return zoom; }         set { zoom = value; }     }       public matrix get_transformation(graphicsdevicemanager graphicsdevice)     {         transform =           matrix.createtranslation(new vector3(-pos.x, -pos.y, 0)) *                                      matrix.createrotationz(rotation) *                                      matrix.createscale(new vector3(zoom, zoom, 0)) *                                      matrix.createtranslation(new vector3(graphicsdevice.graphicsdevice.viewport.width * 0.0f, graphicsdevice.graphicsdevice.viewport.height * 0.0f, 0));         return transform;     }          //zooming         float scrollvalue = mouse.getstate().scrollwheelvalue / 480;         core.cam.zoom = scrollvalue;

basically, each time scroll increase zoom value 0.25, , should something, after 4 scrolls (4*0.25 = 1)

edit:

fixed changing

float scrollvalue = mouse.getstate().scrollwheelvalue / 480;

to

float scrollvalue = mouse.getstate().scrollwheelvalue / 480f;


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