Answer
$31.55\%$
$2400\ g\ FeTiO_3$
Work Step by Step
Atomic weights (g/mol): $Fe: 55.845,\ Ti: 47.867,\ O: 15.99$
Molar mass of $FeTiO_3$: $151.71\ g/mol$
Mass percent of Ti: $47.867/151.71\times100\%=31.55\%$
For 750 g of Ti: $750\ g\ Ti\div 0.3155\ g\ Ti/g\ FeTiO_3= 2400\ g\ FeTiO_3$