Home / 20,191.62-30,255.94-12,780.43

Finding the Fourth Proportional to 20,191.62, 30,255.94 and 12,780.43

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Solution

The fourth proportional to 20,191.62, 30,255.94 and 12,780.43 is: 19,150.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,191.62 : 30,255.94 = 12,780.43 : x
  2. Step 2: Convert to fraction form
    20,191.62/30,255.94 = 12,780.43/x
  3. Step 3: Cross multiply
    20,191.62x = 30,255.94 × 12,780.43
  4. Step 4: Simplify right side
    20,191.62x = 386,683,815.66
  5. Step 5: Solve for x
    x = 386,683,815.66/20,191.62
  6. Step 6: Final answer
    x = 19,150.71

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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.