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Finding the Fourth Proportional to 6,382.80, 8,809.20 and 4,028.40

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Solution

The fourth proportional to 6,382.80, 8,809.20 and 4,028.40 is: 5,559.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,382.80 : 8,809.20 = 4,028.40 : x
  2. Step 2: Convert to fraction form
    6,382.80/8,809.20 = 4,028.40/x
  3. Step 3: Cross multiply
    6,382.80x = 8,809.20 × 4,028.40
  4. Step 4: Simplify right side
    6,382.80x = 35,486,981.28
  5. Step 5: Solve for x
    x = 35,486,981.28/6,382.80
  6. Step 6: Final answer
    x = 5,559.78

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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.