Here is the output of sudo fdisk -l

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x6bdfb4a7

Device Boot Start End Blocks Id System
/dev/sda1 63 80324 40131 de Dell Utility
/dev/sda2 81857 41463807 20690975+ f W95 Ext'd (LBA)
/dev/sda3 * 41463808 500113689 229324941 7 HPFS/NTFS/exFAT
/dev/sda5 81920 41463807 20690944 7 HPFS/NTFS/exFAT

Disk /dev/sdb: 3879 MB, 3879731200 bytes
128 heads, 23 sectors/track, 2573 cylinders, total 7577600 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc3072e18

Device Boot Start End Blocks Id System
/dev/sdb1 * 63 7577599 3788768+ c W95 FAT32 (LBA)

Any other suggestions? (I will do a backup in case things go wrong.)

You have a little free space before sda2 & after sda3. sda3 is moved to the right first.
Then sda2 is resized larger to the left & right. sda5 is part of sda2 so you can deal with it only after you completed resizing sda2.