Home / 20,135.94-30,205.50-8,442.78

Finding the Fourth Proportional to 20,135.94, 30,205.50 and 8,442.78

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Solution

The fourth proportional to 20,135.94, 30,205.50 and 8,442.78 is: 12,664.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,135.94 : 30,205.50 = 8,442.78 : x
  2. Step 2: Convert to fraction form
    20,135.94/30,205.50 = 8,442.78/x
  3. Step 3: Cross multiply
    20,135.94x = 30,205.50 × 8,442.78
  4. Step 4: Simplify right side
    20,135.94x = 255,018,391.29
  5. Step 5: Solve for x
    x = 255,018,391.29/20,135.94
  6. Step 6: Final answer
    x = 12,664.84

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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.