Make my dual booted Kali partition smaller

[ByteMe]

Hi,
I've got Kali dual booted with OSX and I want to make the Kali partition smaller because I don't have enough room on the Mac side any more. However, I can't resize the partitions from Mac because they aren't "partitioned" per se in Disk Manager, it just shows that I have a lot of space filled by "Untitled".

I want to use GParted, but it won't let me resize my Linux partition because obviously it's in use while I run GParted. How do I get around this and make my Kali partition smaller? I've checked a bunch of forums and stuff but haven't managed to find anything useful and I'm at my wit's end for what should be a simple task.

Thanks!

fdisk -l output:

Disk /dev/sda: 233.8 GiB, 251000193024 bytes, 490234752 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt
Disk identifier: xxxx

Device         Start       End   Sectors   Size Type
/dev/sda1         40    409639    409600   200M EFI System
/dev/sda2     409640 324812799 324403160 154.7G Apple HFS/HFS+
/dev/sda3  488965176 490234711   1269536 619.9M Apple boot
/dev/sda4  324812800 472389631 147576832  70.4G Linux filesystem
/dev/sda5  472389632 488964095  16574464   7.9G Linux swap

Partition table entries are not in disk order.

[_defalt]

Boot with kali live and then use Gparted.

[bigbiz]

:-/ Yes that seems right. Gparted is a great program. Workes great for what you need.