Scale the text using a ScaleTransform

<UserControl x:Class='SilverlightApplication3.MainPage'
xmlns='http://schemas.microsoft.com/winfx/2006/xaml/presentation'
xmlns:x='http://schemas.microsoft.com/winfx/2006/xaml'
xmlns:d='http://schemas.microsoft.com/expression/blend/2008'
xmlns:mc='http://schemas.openxmlformats.org/markup-compatibility/2006'
mc:Ignorable='d'
d:DesignWidth='640'
d:DesignHeight='480'>
<StackPanel>
<TextBlock FontSize="32" FontWeight="Bold" Foreground="SteelBlue" Text="asdf" Margin="100, 0, 0, 0">
<TextBlock.RenderTransform>
<ScaleTransform ScaleX="1.5" ScaleY="1.0" />
</TextBlock.RenderTransform>
</TextBlock>
<TextBlock FontSize="32" FontWeight="Bold" Foreground="SteelBlue"
Text="{Binding Path=Text, ElementName=textblockScaleMaster}"
Margin="100, 0, 0, 0">
<TextBlock.RenderTransform>
<ScaleTransform ScaleX="1.0" ScaleY="1.5" />
</TextBlock.RenderTransform>
</TextBlock>
</StackPanel>
</UserControl>
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