#### Explanation:

Let the total sum be $x$
Using ratio but in the format of a fraction.

$\left(\text{isabella")/("Shane}\right) \to \frac{4}{15} \leftarrow$ as a ratio

So we have 4 parts for Isabella and 15 parts for Shane. This gives a total count of parts as $4 + 15 = 19$ parts

As a fraction of the whole Isabella ->4/(4+15)x=$44 4/19x=$44

x=19/4xx$44=$209
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The combined value is \$209