I assume that the 3550 switch is connected to a router (i.e., your default gateway), though this isn't stated in your description.
You have 3 different VLANs on int fa0/5, fa0/6, and fa0/7, respectively.
I do not see your config setup for InterVLAN routing; thus you would require one of your interfaces to be setup as a trunking port ---> this should be the interface that connects to your router (i.e., default gateway).
Simple test: workstation on int fa0/5 cannot ping workstation on int fa0/6 or int fa0/7 since each of these interfaces are in different VLANs. To pass traffic amongst different VLANs, one requires a trunking port; this holds true to also reach your default gateway.
Another approach is to setup InterVLAN routing since the 3550 is a Layer 3 switch.
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