YOU SAID:

I am afraid of the number four.

INTO JAPANESE

私は4番が怖いです。

BACK INTO ENGLISH

I am afraid of the fourth.

INTO JAPANESE

私は4番目が怖いです。

BACK INTO ENGLISH

I'm scared of the fourth.

INTO JAPANESE

私は4人目が怖いです。

BACK INTO ENGLISH

I am scared of the fourth person.

INTO JAPANESE

私は4人目の人が怖いです。

BACK INTO ENGLISH

I am afraid of the fourth person.

INTO JAPANESE

私は4人目の人が怖いです。

BACK INTO ENGLISH

I am afraid of the fourth person.