In the early 1970s, almost every minicomputer had a Fortran compiler. Lisp was much rarer. Pascal had only just been invented and C was only just being invented. If you wanted your software to be as widely portable as possible, your choices were Fortran or Cobol, and no wonder why many preferred the former. (Especially if we are talking about software in academic/research environments, where Fortran was far more common than Cobol.)

This has little to do with Fortran and Lisp's respective years of introduction (1957 vs 1958), but rather how far they'd managed to spread in their first 15 years (almost everywhere for Fortran versus only to a narrow subset of academic research institutions for Lisp.)