Great! Considering that the palette will primarily be used for PowerPoint presentations on the web, I’ve expanded the transitional color palette to include additional accent colors and variations that will enhance your designs while maintaining a cohesive look.

 <Expanded Transitional Palette>
1. Bright Coral - 
                            
                            #E60000
                         - A vibrant and bold red that serves as the primary accent color.
2. Light Gray - 
                            
                            #F0F0F0
                         - A soft and neutral background color that complements the bolder hues.
3. Charcoal - 
                            
                            #333333
                         - A deep gray that provides strong contrast, ideal for text and graphical elements.
4. Soft Peach - 
                            
                            #FFB3B3
                         - A gentle, warm tone that pairs well with bright coral.
5. Warm Beige - 
                            
                            #D9C7B8
                         - A muted neutral that adds warmth and can be used as a subtle element.
6. Dusty Rose - 
                            
                            #D66A89
                         - A subdued pink that harmonizes with bright coral while adding variety.
7. Mid-Tone Teal - 
                            
                            #007A7E
                         - A middle-ground teal that can provide a cooler contrast without being too vibrant.
8. Burnt Orange - 
                            
                            #D26A2D
                         - A warm, earthy orange that adds an energetic feel to the palette and complements the coral.
9. Lavender Gray - 
                            
                            #D6CDE3
                         - A soft lavender that introduces a calming, cool tone to balance the warmer colors.
10. Light Gold - 
                            
                            #F6E0B1
                         - A subtle, warm metallic shade that can be used for highlights and to add a touch of elegance.

Description of the Expanded Palette:

This expanded transitional color palette is tailored for web presentations, providing a harmonious blend of warm and cool tones. The additional colors serve as versatile accents, allowing for greater creativity in your designs. The palette maintains a professional yet inviting aesthetic suitable for various presentation themes.

Follow-Up Questions:

1. Are there any specific themes or topics for the presentations that should be reflected in the color choices?
2. Would you like to see any specific variations or shades for particular colors in this palette?
3. Do you have any preferences for how these colors should be applied (e.g., backgrounds, text, charts)?