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i need help with question 9

 
 
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Re: i need help with question 9
ReynosoDavid - 2020年04月6日 Monday 09:41
 

Let's solve a similar question: Solve the proportion $$\dfrac{2.7}{5.2} = \dfrac{\square}{26}$$

Let $x$ represent the missing number. Cross-multiplying we get $$26 \times 2.7 = 5.2 \times x,$$ if we then divide both sides by $5.2$ we get that $$x = 26\times 2.7 \div 5.2 = 13.5,$$ so the missing number is $13.5$.