To find the value of \( 8.1 \times 4.32 \), we can use the relationship between the numbers.
Notice that:
\[ 8.1 \times 4.32 = \frac{81}{10} \times \frac{432}{100} \]
This can be rewritten as:
\[ = \frac{81 \times 432}{1000} \]
From the problem, we know that \( 81 \times 432 = 34,992 \). So:
\[ 8.1 \times 4.32 = \frac{34,992}{1000} = 34.992 \]
Thus, the answer is:
34.992