Home / 5,479.12-8,220.30-2,190.40

Finding the Fourth Proportional to 5,479.12, 8,220.30 and 2,190.40

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Solution

The fourth proportional to 5,479.12, 8,220.30 and 2,190.40 is: 3,286.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,479.12 : 8,220.30 = 2,190.40 : x
  2. Step 2: Convert to fraction form
    5,479.12/8,220.30 = 2,190.40/x
  3. Step 3: Cross multiply
    5,479.12x = 8,220.30 × 2,190.40
  4. Step 4: Simplify right side
    5,479.12x = 18,005,745.12
  5. Step 5: Solve for x
    x = 18,005,745.12/5,479.12
  6. Step 6: Final answer
    x = 3,286.25

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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.