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Finding the Fourth Proportional to 6,991.20, 10,486.80 and 3,880.80

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Solution

The fourth proportional to 6,991.20, 10,486.80 and 3,880.80 is: 5,821.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,991.20 : 10,486.80 = 3,880.80 : x
  2. Step 2: Convert to fraction form
    6,991.20/10,486.80 = 3,880.80/x
  3. Step 3: Cross multiply
    6,991.20x = 10,486.80 × 3,880.80
  4. Step 4: Simplify right side
    6,991.20x = 40,697,173.44
  5. Step 5: Solve for x
    x = 40,697,173.44/6,991.20
  6. Step 6: Final answer
    x = 5,821.20

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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.