Home / 20,919.94-28,869.87-11,489.38

Finding the Fourth Proportional to 20,919.94, 28,869.87 and 11,489.38

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Solution

The fourth proportional to 20,919.94, 28,869.87 and 11,489.38 is: 15,855.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,919.94 : 28,869.87 = 11,489.38 : x
  2. Step 2: Convert to fraction form
    20,919.94/28,869.87 = 11,489.38/x
  3. Step 3: Cross multiply
    20,919.94x = 28,869.87 × 11,489.38
  4. Step 4: Simplify right side
    20,919.94x = 331,696,906.98
  5. Step 5: Solve for x
    x = 331,696,906.98/20,919.94
  6. Step 6: Final answer
    x = 15,855.54

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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.