Four quantities are said to be in proportion, if the ratio of first and second quantities is equal to the ratio of third and fourth quantities. If two ratios are equal, then we say that they are in proportion and use the symbol ‘:: ‘ or ‘=’ to equate the two ratios.

Answer:## Symbol of the two ratios are equal and they are in proportion ‘:: ‘ or ‘=’

Step-by-step explanation:## pls mark me as branliest

Answer:Four quantities are said to be in proportion, if the ratio of first and second quantities is equal to the ratio of third and fourth quantities. If two ratios are equal, then we say that they are in proportion and use the symbol ‘:: ‘ or ‘=’ to equate the two ratios.

Step-by-step explanation:please mark me as brainlist.