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Finding the Fourth Proportional to 6,418.80, 9,628.20 and 5,479.20

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Solution

The fourth proportional to 6,418.80, 9,628.20 and 5,479.20 is: 8,218.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,418.80 : 9,628.20 = 5,479.20 : x
  2. Step 2: Convert to fraction form
    6,418.80/9,628.20 = 5,479.20/x
  3. Step 3: Cross multiply
    6,418.80x = 9,628.20 × 5,479.20
  4. Step 4: Simplify right side
    6,418.80x = 52,754,833.44
  5. Step 5: Solve for x
    x = 52,754,833.44/6,418.80
  6. Step 6: Final answer
    x = 8,218.80

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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.