Answer:
Step-by-step explanation:
When solving proportions like these, you can set them up using fractions
#1:
[tex]\frac{3}{9} = \frac{2}{x}\\\frac{1}{3} = \frac{2}{x}\\cross \: multiply\\x = 6\\3:9 = 2:6[/tex]
#2:
[tex]\frac{57}{x} = \frac{19}{38}\\\frac{57}{x} = \frac{1}{2} \\x = 114\\57 : 114 = 19 : 38[/tex]
#3:
[tex]\frac{7}{x} = \frac{2}{3} \\21 = 2x\\x = \frac{21}{2} = 10.5\\7:10.5 = 2:3[/tex]
#4
[tex]\frac{15}{2} = \frac{x}{8}\\x = \frac{15*8}{2} = 60\\15:2 = 60:8[/tex]
#5
[tex]\frac{0.3}{4} = \frac{9}{x}\\0.3x = 36\\x = \frac{36}{0.3} = 120 \\0.3:4 = 9:120[/tex]
