Home / 20,916.33-28,861.43-11,961.78

Finding the Fourth Proportional to 20,916.33, 28,861.43 and 11,961.78

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Solution

The fourth proportional to 20,916.33, 28,861.43 and 11,961.78 is: 16,505.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,916.33 : 28,861.43 = 11,961.78 : x
  2. Step 2: Convert to fraction form
    20,916.33/28,861.43 = 11,961.78/x
  3. Step 3: Cross multiply
    20,916.33x = 28,861.43 × 11,961.78
  4. Step 4: Simplify right side
    20,916.33x = 345,234,016.34
  5. Step 5: Solve for x
    x = 345,234,016.34/20,916.33
  6. Step 6: Final answer
    x = 16,505.48

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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.