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Finding the Fourth Proportional to 13,805.89, 20,708.46 and 3,945.11

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Solution

The fourth proportional to 13,805.89, 20,708.46 and 3,945.11 is: 5,917.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,805.89 : 20,708.46 = 3,945.11 : x
  2. Step 2: Convert to fraction form
    13,805.89/20,708.46 = 3,945.11/x
  3. Step 3: Cross multiply
    13,805.89x = 20,708.46 × 3,945.11
  4. Step 4: Simplify right side
    13,805.89x = 81,697,049.09
  5. Step 5: Solve for x
    x = 81,697,049.09/13,805.89
  6. Step 6: Final answer
    x = 5,917.55

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.