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Finding the Fourth Proportional to 7,716.80, 11,575.20 and 2,786.60

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Solution

The fourth proportional to 7,716.80, 11,575.20 and 2,786.60 is: 4,179.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,716.80 : 11,575.20 = 2,786.60 : x
  2. Step 2: Convert to fraction form
    7,716.80/11,575.20 = 2,786.60/x
  3. Step 3: Cross multiply
    7,716.80x = 11,575.20 × 2,786.60
  4. Step 4: Simplify right side
    7,716.80x = 32,255,452.32
  5. Step 5: Solve for x
    x = 32,255,452.32/7,716.80
  6. Step 6: Final answer
    x = 4,179.90

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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.