感兴趣 means to be interested in sth. e.g. 我对飞机很感兴趣 。（I‘m very interested in airplane) 有趣 means something/somebody is interesting or fun. e.g. 开飞机好有趣哟。（Flying an airplane is so interesting/fun.) 有意思 means something is interesting/meaningful. or love between man and woman. e.g. 汤姆对海伦有点意思 （Tom has a thing for Helen）

The above answer is exactly correct! So, I would like to answer this question below. (Also, on google translate 有趣 = interesting. But 很有趣 = very funny. Is this true ?) 有趣 = interesting，很有趣 = very interesting，Very funny=很好笑。 "有趣" shows a feeling that you think the thing is interesting。We use 很好笑 to describe a joke or a comedy. We usually say: 你的笑話很好笑 but not 你的笑話很有趣。 For another example, if you think someone's speech is interesting, you can say: 你的演講很有趣。 It show a feeling that you enjoys the speech.

给你举几个例子： a感兴趣 我对你很感兴趣。（1、我喜欢你。2、我觉得你很有意思，想多了解你。 我对你不感兴趣。（我不喜欢你。） b有趣 我觉得这本书很有趣。 c 有意思 这本书很有意思。=这本书很有趣。 她对你有意思。（她喜欢你。）

Sorry I didn't notice you invite me to answer the question until I reviewed my Notebook today. All of the answers are right, and Lily's answer is more comprehensive. I also would like to add an extra example, that 有趣 also can describe a person. Eg: Tom是个有趣的人。This means "Tom is a funny guy."

Thanks Ben. This clears my doubts about 很有趣。