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Finding the Fourth Proportional to 28,661.39, 42,978.24 and 12,016.96

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Solution

The fourth proportional to 28,661.39, 42,978.24 and 12,016.96 is: 18,019.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,661.39 : 42,978.24 = 12,016.96 : x
  2. Step 2: Convert to fraction form
    28,661.39/42,978.24 = 12,016.96/x
  3. Step 3: Cross multiply
    28,661.39x = 42,978.24 × 12,016.96
  4. Step 4: Simplify right side
    28,661.39x = 516,467,790.95
  5. Step 5: Solve for x
    x = 516,467,790.95/28,661.39
  6. Step 6: Final answer
    x = 18,019.64

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.