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Finding the Fourth Proportional to 8,720.80, 13,080.60 and 2,797.60

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Solution

The fourth proportional to 8,720.80, 13,080.60 and 2,797.60 is: 4,196.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,720.80 : 13,080.60 = 2,797.60 : x
  2. Step 2: Convert to fraction form
    8,720.80/13,080.60 = 2,797.60/x
  3. Step 3: Cross multiply
    8,720.80x = 13,080.60 × 2,797.60
  4. Step 4: Simplify right side
    8,720.80x = 36,594,286.56
  5. Step 5: Solve for x
    x = 36,594,286.56/8,720.80
  6. Step 6: Final answer
    x = 4,196.21

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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.