Once fluent in Spanish, how easy is it to learn other languages?
4 Answers
You do not have to wait until you become fluent in Spanish or any other language before you begin learning another language but you do have to work within the limitations of your own ability.I speak as one who is improving my Spanish, receiving lessons to improve my French, developing my Brazilian Portuguese and have been learning some basic Italian so yes, it usually does becomes easier with practice!
When people learn languages as young children their capacity for learning is usually much greater, than adults, since their brains are still developing It is harder as people grow older but by no means impossible to learn to speak more than one language it depends on your individual ability/ talent as well as the amount of time and effort you are willing to put in to achieve it. Living in a country and immersing yourself in the language naturally will give you the greatest opportunity to learn effectively!
Once a moderate degree of proficiency and confidence has been achieved in the first language it normally becomes easier, relatively speaking, to learn a second foreign language. Older children and Teenagers at school who enjoy learning languages and have some aptitude for langauges often learn and take exams in two or more eg French Spanish and German.
If you have already had some exposure to a second language during childhood; either in a formal setting or through having taken holidays in other countries whose language you wish to learn you should be able to develop your skills and perhaps take a refresher course in your chosen langauge. Even without such early exposure you can still learn a second language, of course, but you would just have to work harder at it than others with more familiarity or ability
I hope that helps 
Portuguese should come pretty easily if you're strong in Spanish, and Italian, and French, basically Spanish is a good starting Romance language for all the others.
It still requires a lot of work, but a lot of the concepts will be familiar, especially if it's another Romance language. My only problem with trying to learn French was that I kept speaking it with a Venezuelan accent, and Spanish words kept popping out.
That depends on your attitude, aptitude and method. You should be able to understand a lot of Portuguese and Italian if they don't speak fast or using slang, and a written French should not be very difficult. Learning any of these will be much easier.
And, apparently, the more languages you speak, the faster you learn new ones.
