You Do Need power plug adapter while traveling from Balearic Islands to Saudi Arabia.

Here is Why You Need An Adapter

The outlet and plug type used in Saudi Arabia is G and in Balearic Islands are C and F. This is how they look like.

Balearic Islands

In Balearic Islands, outlets of type C and F are in use.

Type C

Type F

Saudi Arabia

In Saudi Arabia, outlets of type G are in use.

Type G