Home / 20,800.78-31,188.67-8,135.44

Finding the Fourth Proportional to 20,800.78, 31,188.67 and 8,135.44

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Solution

The fourth proportional to 20,800.78, 31,188.67 and 8,135.44 is: 12,198.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,800.78 : 31,188.67 = 8,135.44 : x
  2. Step 2: Convert to fraction form
    20,800.78/31,188.67 = 8,135.44/x
  3. Step 3: Cross multiply
    20,800.78x = 31,188.67 × 8,135.44
  4. Step 4: Simplify right side
    20,800.78x = 253,733,455.15
  5. Step 5: Solve for x
    x = 253,733,455.15/20,800.78
  6. Step 6: Final answer
    x = 12,198.27

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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.