Home / 5,220.20-7,210.78-3,891.60

Finding the Fourth Proportional to 5,220.20, 7,210.78 and 3,891.60

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Solution

The fourth proportional to 5,220.20, 7,210.78 and 3,891.60 is: 5,375.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,220.20 : 7,210.78 = 3,891.60 : x
  2. Step 2: Convert to fraction form
    5,220.20/7,210.78 = 3,891.60/x
  3. Step 3: Cross multiply
    5,220.20x = 7,210.78 × 3,891.60
  4. Step 4: Simplify right side
    5,220.20x = 28,061,471.45
  5. Step 5: Solve for x
    x = 28,061,471.45/5,220.20
  6. Step 6: Final answer
    x = 5,375.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.