File Size

In Premiere Pro I combined two mpeg files which individually are roughly 220MB and 140MB.

File 1:

Type: MPEG Movie
File Size: 215.61 MB
Image Size: 1920 x 1200
Frame Rate: 25.00
Source Audio Format: 32000 Hz - Compressed - Mono
Project Audio Format: 32000 Hz - 32 bit floating point - Mono
Total Duration: 01:23:12:04
Pixel Aspect Ratio: 1.0
Alpha: None
Video Codec Type: MP4/MOV H.264 4:2:0

File 2:

Type: MPEG Movie
File Size: 133.36 MB
Image Size: 1920 x 1200
Frame Rate: 25.00
Source Audio Format: 32000 Hz - Compressed - Mono
Project Audio Format: 32000 Hz - 32 bit floating point - Mono
Total Duration: 00:24:20:22
Pixel Aspect Ratio: 1.0
Alpha: None
Video Codec Type: MP4/MOV H.264 4:2:0

Trimmed beginning and end times of videos.

Selected "File | Export | Media...".

Turned on "Export Settings | Match Sequence Settings".

Selected "Output | Source Scaling: | Change Output Size to Match Source"

Selected "Export"

Resulting file is 12GB.

How do I get the resulting file down closer to the original combined file sizes (360MB) and maintain the resolution and quality of the original files?