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Proportional relationships (three or four SAT questions per test) cover direct proportion (y = kx), inverse proportion (y = k/x), and joint variation (like weight proportional to mass and inversely proportional to radius squared). You will compute the constant of proportionality and use it to find missing values. Difficulty adapts as you go, each question has a step-by-step solution, and an AI tutor is there for the ones you miss.