When the rate of any foreign currency is not set by the country's banking system, the value of this indicator can be calculated independently using the method of crosses or cross rates.
Instructions
Step 1
If you want to know, for example, how many rubles one Mexican peso is worth, you will not find this information on the websites of banks or financial companies, since the Central Bank of the Russian Federation does not set this indicator daily or weekly. You will have to calculate it mathematically using the rates of other currencies.
Step 2
Select the currency with which you will calculate the cross rate. The simplest and most obvious option is to choose the euro or the dollar, the value of these monetary units can be expressed in any currency, they have quotes in all countries of the world.
Step 3
Search the internet for information on how much Mexican pesos are worth one euro on a specific date. This indicator is set by the European Central Bank. For example, on September 21, 2011 the exchange rate was 16.8631 MXN (Mexican peso).
Step 4
Find out the euro / ruble exchange rate for a given date. On September 21, 2011, one euro cost 42.9164 rubles. This indicator can be viewed on the official website of the Central Bank of Russia.
Step 5
Now compare that you have the expression of one currency (euro) in terms of two others. For simplicity, write an equation where, on the one hand, there is the Mexican peso with a multiplier equal to the exchange rate against the euro, and on the other hand, the ruble with a similar multiplier.
16.8631 MXN = 42,9164 RUB.
Step 6
Choose the value of which indicator you want to know - how much peso is one ruble, or how much is one Mexican peso. Depending on what exactly interests you, divide both sides of the equation by the multiplier of the currency you want.
Step 7
Divide both sides of the equation by 16.8631. So on September 21, 2011, 1 Mexican peso is worth 2.54 rubles.
Step 8
Divide both sides of the equation by 42, 9164. It turns out that on the same day you need to pay 39, 29 centavos for one ruble, or 39 Mexican pesos and 29 centavos for 100 rubles.
