Download the GParted Live-CD.
Backup all your valuable data, and if necessary your /-partition, during resizing data may get lost.
Start from the GParted CD.
Delete partitions 2-4, resize partition 1 as wanted, recreate the other partitions.
Copy your data back.
Keep in mind that if your system uses UUIDs you have to adapt /etc/fstab to the new IDs.