Some adjectives need a preposition before their object. There doesn't seem to be a logical rule, I'm afraid! We just need to learn them.

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Here are some of the most common ones:

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famous for 

France is famous for its food.

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proud of

He is very proud of his new car.

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interested in

Julie is very interested in sport.

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pleased with

John is very pleased with his new suit.

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bad at

They are very bad at Maths.

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good at

Einstein was very good at physics.

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married to

My mother has been married to my father for 20 years.

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excited about

I'm very excited about my holiday.

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different from / to

Coffee is different from tea.

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afraid of

I'm afraid of spiders.