Home / 3,405.72-5,105.79-1,213.20

Finding the Fourth Proportional to 3,405.72, 5,105.79 and 1,213.20

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Solution

The fourth proportional to 3,405.72, 5,105.79 and 1,213.20 is: 1,818.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.72 : 5,105.79 = 1,213.20 : x
  2. Step 2: Convert to fraction form
    3,405.72/5,105.79 = 1,213.20/x
  3. Step 3: Cross multiply
    3,405.72x = 5,105.79 × 1,213.20
  4. Step 4: Simplify right side
    3,405.72x = 6,194,344.43
  5. Step 5: Solve for x
    x = 6,194,344.43/3,405.72
  6. Step 6: Final answer
    x = 1,818.81

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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.