Forex calculation

having a "bit of a moment" and cant seem to think this through properly. if we take GBP, USD and EUR we see that they are all linked, when one moves so do the others.

is it possible to work out what EUR/USD would be if GBP/EUR was at x.xxxx?

No it's not possible. You need a third pair to relate the other two. Your missing pair is GBP/USD. To find the value of EUR/USD the formula would be:

EUR/USD = (GBP/USD) / (GBP/EUR).

So for example if GBP/USD is 2.00 and GBP/EUR is 1.30 then:

EUR/USD = 2/1.3 = 1.5385

dam that'll be why i couldn't work it out lol, cheers man

By the way, this is why you hear references to "triangular arbitrage" in FOREX. The only way that prices can be "out of line" is in the relationship between 3 (or more) related pairs.

No prob. Cheers!