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Finding the Fourth Proportional to 11,405.20, 17,120.60 and 8,819.60

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Solution

The fourth proportional to 11,405.20, 17,120.60 and 8,819.60 is: 13,239.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,405.20 : 17,120.60 = 8,819.60 : x
  2. Step 2: Convert to fraction form
    11,405.20/17,120.60 = 8,819.60/x
  3. Step 3: Cross multiply
    11,405.20x = 17,120.60 × 8,819.60
  4. Step 4: Simplify right side
    11,405.20x = 150,996,843.76
  5. Step 5: Solve for x
    x = 150,996,843.76/11,405.20
  6. Step 6: Final answer
    x = 13,239.30

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1.5x scale

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.