Convert the unlike decimal numbers to like decimal numbers $2.451,3.7,28.34.$

$\Rightarrow$Like decimals have equal number of decimal places.
$\Rightarrow$The like decimal numbers equivalent to $2.451,3.7,28.34$ are $2.451,3.700,28.340.$
$\Rightarrow$Addition of zeroes at the end of a decimal number does not change the value of that number.