where 26 is the alargar for 100 miles (as given in the second column of the table  ). This is easily done by the simple "Rule of Three", a method of cross-multiplication, using three numbers to solve for the fourth by successive multiplication and division: So, sailing for 65 miles on SE by E implies alargar = = 16.9 miles. The avanzar, etc. can be figured out analogously.
where 55 is the alargar for 100 miles (as given in the second column of the table at q = 3 ). This is easily done by the simple "Rule of Three", a method of cross-multiplication, using three numbers to solve for the fourth by successive multiplication and division: So, sailing for 65 miles on SE by E implies alargar = = 35.75 miles. The avanzar, etc. can be figured out analogously.
R
26
55
A
at q = 3
R
16.9
35.75