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Finding the Fourth Proportional to 8,138.80, 11,080.72 and 8,113.60

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Solution

The fourth proportional to 8,138.80, 11,080.72 and 8,113.60 is: 11,046.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,138.80 : 11,080.72 = 8,113.60 : x
  2. Step 2: Convert to fraction form
    8,138.80/11,080.72 = 8,113.60/x
  3. Step 3: Cross multiply
    8,138.80x = 11,080.72 × 8,113.60
  4. Step 4: Simplify right side
    8,138.80x = 89,904,529.79
  5. Step 5: Solve for x
    x = 89,904,529.79/8,138.80
  6. Step 6: Final answer
    x = 11,046.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.