To determine the amount of salt that equals 242mg sodium, we need to consider that sodium makes up approximately 39.3% of table salt (NaCl). Therefore, we can calculate the amount of salt as follows:

Amount of salt = (Amount of sodium) / (Percentage of sodium in salt)

Amount of salt = 242mg / 0.393

Amount of salt ≈ 615.52mg

Since we are dealing with small quantities, it's more convenient to express the result in milligrams (mg). Therefore, 242mg sodium is equivalent to approximately 615.52mg of table salt.