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Finding the Fourth Proportional to 212,066.10, 317,989.80 and 78,877.80

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Solution

The fourth proportional to 212,066.10, 317,989.80 and 78,877.80 is: 118,276.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,066.10 : 317,989.80 = 78,877.80 : x
  2. Step 2: Convert to fraction form
    212,066.10/317,989.80 = 78,877.80/x
  3. Step 3: Cross multiply
    212,066.10x = 317,989.80 × 78,877.80
  4. Step 4: Simplify right side
    212,066.10x = 25,082,335,846.44
  5. Step 5: Solve for x
    x = 25,082,335,846.44/212,066.10
  6. Step 6: Final answer
    x = 118,276.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.