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Finding the Fourth Proportional to 15,105.92, 20,845.76 and 8,391.56

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Solution

The fourth proportional to 15,105.92, 20,845.76 and 8,391.56 is: 11,580.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.92 : 20,845.76 = 8,391.56 : x
  2. Step 2: Convert to fraction form
    15,105.92/20,845.76 = 8,391.56/x
  3. Step 3: Cross multiply
    15,105.92x = 20,845.76 × 8,391.56
  4. Step 4: Simplify right side
    15,105.92x = 174,928,299.60
  5. Step 5: Solve for x
    x = 174,928,299.60/15,105.92
  6. Step 6: Final answer
    x = 11,580.12

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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.