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Finding the Fourth Proportional to 20,858.88, 28,785.68 and 11,426.88

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Solution

The fourth proportional to 20,858.88, 28,785.68 and 11,426.88 is: 15,769.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,858.88 : 28,785.68 = 11,426.88 : x
  2. Step 2: Convert to fraction form
    20,858.88/28,785.68 = 11,426.88/x
  3. Step 3: Cross multiply
    20,858.88x = 28,785.68 × 11,426.88
  4. Step 4: Simplify right side
    20,858.88x = 328,930,511.08
  5. Step 5: Solve for x
    x = 328,930,511.08/20,858.88
  6. Step 6: Final answer
    x = 15,769.33

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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.