Question

What is the value of a?
5 units
5 1/3
6 2/3
7 units​

Answer 1

a = 5.333...

or

5 1/3

Explanation:

are 2 similar triangles, we solve with a proportion between the corresponding sides, see the figure below

4 : a = 3 : 4

a = 4 × 4 : 3

a = 16 : 3

a = 5.333...

or a = 5 1/3 (your answer)