To use the concept of proportion to make the given conversion. Given information: To convert...

Calculation:
As we know that from the definition, a mathematical equation signifying equality of two ratios is called a proportion. Proportion is used when three quantities are known and fourth quantity is unknown. We can use equality of two ratios for finding the fourth unknown quantity. For example: ${\displaystyle \frac{a}{b}=\frac{c}{d}}$ is a proportion.
As we know that 1 pounds ${\displaystyle =16}$ ounces.
So, we can write in the form of ratio as ${\displaystyle \frac{1pound}{16ounce}}$.
Let us suppose x pounds ${\displaystyle =146.4}$ ounces
So, we can write in the form of ratio as ${\displaystyle \frac{xpound}{146.4ounce}}$
As per the definition of proportion both ratio should be equal. i.e.
${\displaystyle \frac{1pound}{16ounce}=\frac{xpound}{146.4ounce}}$
Applying cross multiplication.
${\displaystyle 16\times x=146.4\times 1}$
${\displaystyle \Rightarrow 16x=146.4}$
${\displaystyle \Rightarrow \frac{16x}{16}=\frac{146.4}{16}}$ [Divide both sides by 16]
${\displaystyle \Rightarrow x=9.15}$ pounds
Hence, we can say that 9.15 pounds ${\displaystyle =146.4}$ ounces.

Answer is given below (on video)