Home / 5,408.20-8,121.90-4,178.60

Finding the Fourth Proportional to 5,408.20, 8,121.90 and 4,178.60

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Solution

The fourth proportional to 5,408.20, 8,121.90 and 4,178.60 is: 6,275.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,408.20 : 8,121.90 = 4,178.60 : x
  2. Step 2: Convert to fraction form
    5,408.20/8,121.90 = 4,178.60/x
  3. Step 3: Cross multiply
    5,408.20x = 8,121.90 × 4,178.60
  4. Step 4: Simplify right side
    5,408.20x = 33,938,171.34
  5. Step 5: Solve for x
    x = 33,938,171.34/5,408.20
  6. Step 6: Final answer
    x = 6,275.32

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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.