Home / 5,408.80-8,108.40-3,215.20

Finding the Fourth Proportional to 5,408.80, 8,108.40 and 3,215.20

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Solution

The fourth proportional to 5,408.80, 8,108.40 and 3,215.20 is: 4,819.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,408.80 : 8,108.40 = 3,215.20 : x
  2. Step 2: Convert to fraction form
    5,408.80/8,108.40 = 3,215.20/x
  3. Step 3: Cross multiply
    5,408.80x = 8,108.40 × 3,215.20
  4. Step 4: Simplify right side
    5,408.80x = 26,070,127.68
  5. Step 5: Solve for x
    x = 26,070,127.68/5,408.80
  6. Step 6: Final answer
    x = 4,819.95

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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.