Home / 20,912.89-28,859.42-11,481.38

Finding the Fourth Proportional to 20,912.89, 28,859.42 and 11,481.38

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Solution

The fourth proportional to 20,912.89, 28,859.42 and 11,481.38 is: 15,844.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.89 : 28,859.42 = 11,481.38 : x
  2. Step 2: Convert to fraction form
    20,912.89/28,859.42 = 11,481.38/x
  3. Step 3: Cross multiply
    20,912.89x = 28,859.42 × 11,481.38
  4. Step 4: Simplify right side
    20,912.89x = 331,345,967.60
  5. Step 5: Solve for x
    x = 331,345,967.60/20,912.89
  6. Step 6: Final answer
    x = 15,844.11

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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.