Home / 7,880.20-11,820.30-3,984.10

Finding the Fourth Proportional to 7,880.20, 11,820.30 and 3,984.10

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Solution

The fourth proportional to 7,880.20, 11,820.30 and 3,984.10 is: 5,976.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,880.20 : 11,820.30 = 3,984.10 : x
  2. Step 2: Convert to fraction form
    7,880.20/11,820.30 = 3,984.10/x
  3. Step 3: Cross multiply
    7,880.20x = 11,820.30 × 3,984.10
  4. Step 4: Simplify right side
    7,880.20x = 47,093,257.23
  5. Step 5: Solve for x
    x = 47,093,257.23/7,880.20
  6. Step 6: Final answer
    x = 5,976.15

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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.