Grep searching specific pattern

I have a text like:

94.98 bla bla bla bla
98.456 bla bla bla bla
104.984 bla bla bla bla
194.982 bla bla bla bla

And I do a Grep:

grep 94.98 $text_file

But I obtain this:

94.98 bla bla bla bla
194.982 bla bla bla bla

How can I make the search exclusively specific and force "grep" to only search "94.98" ??

Thank you!