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Finding the Fourth Proportional to 6,287.60, 8,674.20 and 3,930.80

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Solution

The fourth proportional to 6,287.60, 8,674.20 and 3,930.80 is: 5,422.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,287.60 : 8,674.20 = 3,930.80 : x
  2. Step 2: Convert to fraction form
    6,287.60/8,674.20 = 3,930.80/x
  3. Step 3: Cross multiply
    6,287.60x = 8,674.20 × 3,930.80
  4. Step 4: Simplify right side
    6,287.60x = 34,096,545.36
  5. Step 5: Solve for x
    x = 34,096,545.36/6,287.60
  6. Step 6: Final answer
    x = 5,422.82

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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.