Before we do, let's deal with the fingering. Once again, the fingering given is "theoretical fingering". It looks good, it looks logical; however, it is not useful for real playing. For actual playing, it is much better to learn a fingering for this scale that we can actually use for the licks that are played from this scale.

What is wrong with the fingering? The 4th finger is used on the bending notes, instead of 3 (which is better for bending because it is stronger).  Using 2 and 4 as given is good fingering if you are using the scale as you would a major scale, using the notes with no bends. But we are playing Blues here, so it is safe to assume we will be bending notes. Also, you will find that, like Scale 2 & 3, it is the notes on the strings 1,2, and 3 you will be using most.

Suggested fingering for 4th Minor Pentatonic Scale. Note use of 2nd finger to make shift of position on 3rd string.

I would also like to make this point about learning the Minor Pentatonics. It is very important to learn the musical function of each scale tone as we learn the scales. We want to grow beyond simply placing our fingers in different places without having a mental understanding of the notes we are playing (although the ear/emotional connection will always be primary).  Knowing what we are doing, and why different licks work the way they do allows us to expand as musicians, and exploit all our potential.

The notes of the Minor Pentatonic each have a name, a number name. The name is derived from comparison with the Major Scale.  Each note of a Major Scale has a number name:

It is our job as guitarists to know 2 things:   1) the number name of each note found in each scale. 2) the musical function (quality or effect) of each numbered note.

For instance, the root note is home base, and provides the resting place, or end point for phrases ending on the tonic chord (chord with same letter name as the key). The b3 is a "blues note", providing the blues sound, and is also a bending note.

Of course, these notes are found in different locations in each scale, and contained within different finger patterns, which is what makes each scale suited for different types of licks.

Here are the notes of Scale 4 with their number names shown:
 

Illustration of suggested fingering: Let's look at a song you may have heard of, "Stairway To Heaven". This part of the solo shows where this fingering would be used effectively.

  slow                        fast

We start here with the Minor Pentatonic #1, in 5th position (we are in the key of A minor). We add the natural 6th to the scale, since we are playing in minor, against a modal progression using Am-G-F-G (the added note is an F).

The shift to Scale 4 is done along the 4th string, sliding the 3rd finger

Use 2, not 3 for fret 14, this brings 1 into position at 13, ready to play, and 3 ready for upcoming bend of 15.