Based on the passage, why was it so important that the scholars figured out that the inscription was the same in all three languages on the stone?

Answer:

It was important because the scholars already knew how to read the Greek alphabet, but they did not know how to read the Egyptian hieroglyphs. By determining that all three inscriptions said the same thing, they were able to use the known Greek text as a guide to translate and unlock the meaning of the ancient Egyptian hieroglyphs.