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Finding the Fourth Proportional to 8,478.88, 12,720.48 and 3,286.24

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Solution

The fourth proportional to 8,478.88, 12,720.48 and 3,286.24 is: 4,930.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478.88 : 12,720.48 = 3,286.24 : x
  2. Step 2: Convert to fraction form
    8,478.88/12,720.48 = 3,286.24/x
  3. Step 3: Cross multiply
    8,478.88x = 12,720.48 × 3,286.24
  4. Step 4: Simplify right side
    8,478.88x = 41,802,550.20
  5. Step 5: Solve for x
    x = 41,802,550.20/8,478.88
  6. Step 6: Final answer
    x = 4,930.20

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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.