[
  "For equivalent ratios, find the multiplier or divisor that connects the two known corresponding terms.",
  "The right side changed from 5 to 50: 50 / 5 = 10, so multiply by 10. Apply the same to the left: 15 x 10 = 150.",
  "The missing term is 150. So 150 : 50 = 15 : 5."
]