N3 — outside your level filter
therefore; accordingly — the conclusion that follows from what was just established
会員数は三年連続で減少している。したがって、料金体系の見直しが必要である。
kaiinsuu wa sannen renzoku de genshou shite iru. shitagatte, ryoukin taikei no minaoshi ga hitsuyou de aru.
Membership has fallen for three consecutive years. The fee structure therefore needs to be reviewed. formal
この時間帯は道が非常に混みます。したがって、車ではなく電車で向かう必要があります。
kono jikantai wa michi ga hijou ni komimasu. shitagatte, kuruma de wa naku densha de mukau hitsuyou ga arimasu.
The roads are extremely congested at this hour. You therefore need to travel by train rather than by car. neutral
Variants
従ってshitagattealternant
the kanji spelling, seen in older and heavier writing; style guides and newspapers write the connective in kana, which keeps it clear of the verb 従う, spelled the same.
したがいましてshitagaimashiteformal
the ます-form's て-form (したがい＋まして), for spoken business and customer-facing writing — announcements and apologies reach for it where bare したがって would sound like a report read aloud.
したがって
したがってshitagatteN3formal