Answer:
Because we are in the process of evolving smaller jaws, most of us do not have adequate room for all four of our 3rd molars or wisdom teeth. And, also as proof of evolving, not all of us have all four wisdom teeth. I only had three, my wife had two. I have seen patients who never had any. That is indeed, a blessing. As to your question; NO, just because one came in straight you are not guaranteed that they all will. In fact, the odds are against it. Do yourself a favor, get rid of all of your wisdom teeth while you are young. We don't chew on them as they are posterior to our plane of chewing. They are just excess baggage and they make it harder to keep the really important teeth clean.
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go to your dentist and get xrays done – thats the only way to know what position they are in. you may not have enough room which may leave them impacted (under the gum/bone) or there may be room and they should be straight, some people don't have all 4 wisdom teeth errupted so it's best to get your dentist to confirm for you.