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Finding the Fourth Proportional to 3,479.88, 5,220.07 and 1,399.90

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Solution

The fourth proportional to 3,479.88, 5,220.07 and 1,399.90 is: 2,099.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,479.88 : 5,220.07 = 1,399.90 : x
  2. Step 2: Convert to fraction form
    3,479.88/5,220.07 = 1,399.90/x
  3. Step 3: Cross multiply
    3,479.88x = 5,220.07 × 1,399.90
  4. Step 4: Simplify right side
    3,479.88x = 7,307,559.44
  5. Step 5: Solve for x
    x = 7,307,559.44/3,479.88
  6. Step 6: Final answer
    x = 2,099.94

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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.