Home / 20,999.42-28,979.20-11,568

Finding the Fourth Proportional to 20,999.42, 28,979.20 and 11,568

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Solution

The fourth proportional to 20,999.42, 28,979.20 and 11,568 is: 15,963.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.42 : 28,979.20 = 11,568 : x
  2. Step 2: Convert to fraction form
    20,999.42/28,979.20 = 11,568/x
  3. Step 3: Cross multiply
    20,999.42x = 28,979.20 × 11,568
  4. Step 4: Simplify right side
    20,999.42x = 335,231,385.60
  5. Step 5: Solve for x
    x = 335,231,385.60/20,999.42
  6. Step 6: Final answer
    x = 15,963.84

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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.