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Finding the Fourth Proportional to 20,842.36, 28,761.88 and 11,889.68

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Solution

The fourth proportional to 20,842.36, 28,761.88 and 11,889.68 is: 16,407.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,842.36 : 28,761.88 = 11,889.68 : x
  2. Step 2: Convert to fraction form
    20,842.36/28,761.88 = 11,889.68/x
  3. Step 3: Cross multiply
    20,842.36x = 28,761.88 × 11,889.68
  4. Step 4: Simplify right side
    20,842.36x = 341,969,549.40
  5. Step 5: Solve for x
    x = 341,969,549.40/20,842.36
  6. Step 6: Final answer
    x = 16,407.43

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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.