Home / 20,861.28-28,791.45-11,909.57

Finding the Fourth Proportional to 20,861.28, 28,791.45 and 11,909.57

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Solution

The fourth proportional to 20,861.28, 28,791.45 and 11,909.57 is: 16,436.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,861.28 : 28,791.45 = 11,909.57 : x
  2. Step 2: Convert to fraction form
    20,861.28/28,791.45 = 11,909.57/x
  3. Step 3: Cross multiply
    20,861.28x = 28,791.45 × 11,909.57
  4. Step 4: Simplify right side
    20,861.28x = 342,893,645.22
  5. Step 5: Solve for x
    x = 342,893,645.22/20,861.28
  6. Step 6: Final answer
    x = 16,436.85

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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.