Home / 5,408.20-8,112.30-2,121.40

Finding the Fourth Proportional to 5,408.20, 8,112.30 and 2,121.40

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Solution

The fourth proportional to 5,408.20, 8,112.30 and 2,121.40 is: 3,182.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,408.20 : 8,112.30 = 2,121.40 : x
  2. Step 2: Convert to fraction form
    5,408.20/8,112.30 = 2,121.40/x
  3. Step 3: Cross multiply
    5,408.20x = 8,112.30 × 2,121.40
  4. Step 4: Simplify right side
    5,408.20x = 17,209,433.22
  5. Step 5: Solve for x
    x = 17,209,433.22/5,408.20
  6. Step 6: Final answer
    x = 3,182.10

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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.