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Finding the Fourth Proportional to 20,661.32, 28,512.72 and 11,229.88

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Solution

The fourth proportional to 20,661.32, 28,512.72 and 11,229.88 is: 15,497.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,661.32 : 28,512.72 = 11,229.88 : x
  2. Step 2: Convert to fraction form
    20,661.32/28,512.72 = 11,229.88/x
  3. Step 3: Cross multiply
    20,661.32x = 28,512.72 × 11,229.88
  4. Step 4: Simplify right side
    20,661.32x = 320,194,225.36
  5. Step 5: Solve for x
    x = 320,194,225.36/20,661.32
  6. Step 6: Final answer
    x = 15,497.28

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.