Introduction to proportions

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Ratios, Rates, and Proportions
- What are they?
- How are they different from each other?
How to do cross-multiplication?

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Find the missing value.
1. $\frac{3}{4} = \frac{9}{{}}$
2. $\frac{5}{{}} = \frac{{30}}{{36}}$
3. $\frac{{21}}{{49}} = \frac{{}}{7}$
4. $\frac{{}}{5} = \frac{{18}}{{30}}$
A butter cookie recipe calls for 250 g of butter and 170 g of sugar. How much sugar is needed if there is 625 g of butter?
The scale of a map is 1.5 cm to 30 km. What is the actual distance between two places which are 33.5 cm apart from each other on the map?
There is 54 g of fruits in a smoothie. If the ratio of strawberry and blueberry in the smoothie is 5:4, how much of each fruit is there in the smoothie?

Proportions