5g-------100mlm X-------200ml

To solve this proportion, we can set up the equation:

5g/100ml = X/200ml

To find the value of X, we can cross-multiply and solve for X:

5g * 200ml = 100ml * X

1000g = 100ml * X

To isolate X, we divide both sides of the equation by 100ml:

X = 1000g / 100ml

Simplifying further:

X = 10g/ml