What is Ralph's purpose of building a fire?
Ralph 's main purpose, as pointed out by the previous post, is to build a large fire and use it to signal a ship. He builds a fire on a platform on the mountain and the boys pitch in enthusiastically to...
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Ralph's purpose for building a fire is to get help.
He knew the the smoke from the fire would create a signal for help for other boats in the ocean.
He wanted to get off the island (along with others on the island) because he knew troubles were going to come up.