Question

If 15,20,30 are in proportion, the first proportional is:

Answer 1

Answer:

Let, 1st proportional = x

then ,

x:15=20:30

=> x = (15×20)/30

=> x = 10

Step-by-step explanation:

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Answer 2

Answer:

The first proportion is 40

Step-by-step explanation:

Let the first proportion be $x$ = $x$:15::20:30

Product of means = Product of extremes

20 * 15 = $x$  * 30

20 * $\frac{15}{30}$ = $x$

$x$ = 10

Hence, the first proportion is 10

Check:

Product of means = Product of extremes

15 x 20 = 10 x 30

300 = 300

Hence, approved