Question

Find the fourth proportion 2.1 , 1.5 , 8.4

Answer 1

Answer:

let fourth proportional = x

then ,

2.1 : 1.5 : 8.4 : x

cross multiply

$\frac{2.1}{1.5} = \frac{8.4}{x}$

2.1x = 8.4 \times 1.5

x =  $\frac{8.4 \times 1.5}{2.1}$

x = $\frac{12.6}{2.1}$

x = 6

∴ Your answer is 6

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Answer 2

Step-by-step explanation:

let fourth proportional = x

then ,

2.1 : 1.5 : 8.4 : x

cross multiply

\frac{2.1}{1.5} = \frac{8.4}{x}

1.5

2.1

=

x

8.4

2.1x = 8.4 \times 1.5

x = \frac{8.4 \times 1.5}{2.1}

2.1

8.4×1.5

x = \frac{12.6}{2.1}

2.1

12.6

x = 6

∴ Your answer is 6

Step-by-step explanation:

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AND