Home / 10,080.20-15,120.30-5,414.60

Finding the Fourth Proportional to 10,080.20, 15,120.30 and 5,414.60

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Solution

The fourth proportional to 10,080.20, 15,120.30 and 5,414.60 is: 8,121.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,080.20 : 15,120.30 = 5,414.60 : x
  2. Step 2: Convert to fraction form
    10,080.20/15,120.30 = 5,414.60/x
  3. Step 3: Cross multiply
    10,080.20x = 15,120.30 × 5,414.60
  4. Step 4: Simplify right side
    10,080.20x = 81,870,376.38
  5. Step 5: Solve for x
    x = 81,870,376.38/10,080.20
  6. Step 6: Final answer
    x = 8,121.90

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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.