To what extent was the progressive movement of 1900-1920 an extension of reformers ideas and programs of the late nineteenth century?

During the last decade of the 19th century, the Populists
were the most prominent reformers in the United States.  Although they died out in that
same decade, some of their ideas lived on with the Progressives.  The Progressives took
many of the Populists' ideas, but they went beyond those ideas to become involved in
many types of reforms that the Populists did not have in
mind.

The main reforms that the Progressives took up were
reforms that were aimed against the powers of the big businesses.  For example, the
"trustbusting" of Theodore Roosevelt came from Populist ideas.  As the "salem-history"
link says, Populist

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farmers believed that they were at the mercy of
monopolies and speculators, and they demanded government legislation regarding the
control of money, transportation, and
land.

However, the
Progressives went well beyond this sort of reform.  For example, they were interested in
political reforms (breaking the power of urban machines) and in social reforms
(Prohibition).  These were types of reforms that were not prominent in the Populist
agenda.

Some of the Populist agenda (crackdowns on the
power of big business) did become part of the Progressive agenda.  However, many of the
Progressives' reforms were new with them and were not extensions of the previous
reformers' efforts.