Just add extra of everything else, but in the correct proportions.

With numismatic fakes, the counterfeiter might use the correct proportions of gold, but try to replicate an older coin with special rarity value.

The cake and jelly bind together and produce a pleasant texture if made in the correct proportions.

Circular arc segments must be constructed as transversals to provide the correct proportions.

Under this approach, we replicate the cash flows on the option by holding a risk free bond and the underlying in the correct proportions.