Home / 20,128.78-30,193.23-6,981.15

Finding the Fourth Proportional to 20,128.78, 30,193.23 and 6,981.15

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Solution

The fourth proportional to 20,128.78, 30,193.23 and 6,981.15 is: 10,471.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,128.78 : 30,193.23 = 6,981.15 : x
  2. Step 2: Convert to fraction form
    20,128.78/30,193.23 = 6,981.15/x
  3. Step 3: Cross multiply
    20,128.78x = 30,193.23 × 6,981.15
  4. Step 4: Simplify right side
    20,128.78x = 210,783,374.68
  5. Step 5: Solve for x
    x = 210,783,374.68/20,128.78
  6. Step 6: Final answer
    x = 10,471.74

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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.