Solve the following proportion for the unknown quantity: 
Definitions:
Parasitism Rates
The frequency or proportion at which parasitism occurs within a host population, affecting host dynamics and ecosystem relationships.
Parental Care
The investment made by parents in the survival of their offspring, which can include feeding, protection, and teaching of survival skills.
Colored Gapes
Visual cues, often bright colors inside the mouths of bird fledglings, that stimulate feeding behavior by parent birds.
Facultative Siblicide
The conditional behavior in which an individual, usually a sibling, is killed based on environmental conditions or resource availability.
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