AC1/C1B *BA1/A1C *CB1/B1A =1 (теорема Чевы)  

1/1 *BA1/A1C *2/1 =1 <=> BA1/A1C =1/2  

BC1/C1A *AX/XA1 *A1C/CB =1 (теорема Менелая)  

1/1 *AX/XA1 *2/3 =1 <=> AX/XA1 =3/2  

BA1/A1C *CX/XC1 *C1A/AB =1 (теорема Менелая)  

1/2 *CX/XC1 *1/2 =1 <=> XC1/CX =1/4