Here is a simple riddle about numbers.
How would you insert 4 inside 5?
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Which is
F(IV)E
Where
IV = 4
So we acheieved
4(IV) inside 5 (FIVE)
I might not be taking this question seriously enough...
As an apology for my previous answer, I'd like to offer the following:
Five fenceposts can have four panels of fencing placed between them.
And,
A '5' lit up on a 7-segment display will have four interior right angles. (By coincidence of it being made of also 5 distinct segments.)
And stretching it,
according to Wikipedia's page of List of numbers in various languages, there are no languages where the common word for 'four' is a subset or anagram subset of the word for 'five', at least as far as I could tell with my layman's eye, which was a bit of a disappointment. But graphically speaking, in the Tai-Kadai language Lao, 4 could fit into 5 quite neatly.
.