Final answer:
The missing element from the financial goal is a specific time frame which is needed to make the goal SMART, particularly 'Time-bound'.
Step-by-step explanation:
The element missing from the following financial goal "I will save $75 each week to go on a vacation to Hawaii" is a time frame. A time frame is crucial for setting a SMART goal, which stands for Specific, Measurable, Achievable, Relevant, and Time-bound. To complete the goal, it could be revised to: "I will save $75 each week for the next year to go on a vacation to Hawaii." This adjustment adds a specific time frame that allows for planning and tracking progress towards the goal.