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Finding the Fourth Proportional to 20,999.25, 28,978.97 and 11,568.42

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Solution

The fourth proportional to 20,999.25, 28,978.97 and 11,568.42 is: 15,964.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.25 : 28,978.97 = 11,568.42 : x
  2. Step 2: Convert to fraction form
    20,999.25/28,978.97 = 11,568.42/x
  3. Step 3: Cross multiply
    20,999.25x = 28,978.97 × 11,568.42
  4. Step 4: Simplify right side
    20,999.25x = 335,240,838.29
  5. Step 5: Solve for x
    x = 335,240,838.29/20,999.25
  6. Step 6: Final answer
    x = 15,964.42

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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.