Home / 20,857.50-28,786.10-11,906.75

Finding the Fourth Proportional to 20,857.50, 28,786.10 and 11,906.75

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Solution

The fourth proportional to 20,857.50, 28,786.10 and 11,906.75 is: 16,432.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,857.50 : 28,786.10 = 11,906.75 : x
  2. Step 2: Convert to fraction form
    20,857.50/28,786.10 = 11,906.75/x
  3. Step 3: Cross multiply
    20,857.50x = 28,786.10 × 11,906.75
  4. Step 4: Simplify right side
    20,857.50x = 342,748,896.18
  5. Step 5: Solve for x
    x = 342,748,896.18/20,857.50
  6. Step 6: Final answer
    x = 16,432.88

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.