Home / 4,286.40-6,415.20-3,940.80

Finding the Fourth Proportional to 4,286.40, 6,415.20 and 3,940.80

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Solution

The fourth proportional to 4,286.40, 6,415.20 and 3,940.80 is: 5,897.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,286.40 : 6,415.20 = 3,940.80 : x
  2. Step 2: Convert to fraction form
    4,286.40/6,415.20 = 3,940.80/x
  3. Step 3: Cross multiply
    4,286.40x = 6,415.20 × 3,940.80
  4. Step 4: Simplify right side
    4,286.40x = 25,281,020.16
  5. Step 5: Solve for x
    x = 25,281,020.16/4,286.40
  6. Step 6: Final answer
    x = 5,897.96

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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.