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Finding the Fourth Proportional to 28,406.80, 39,199.81 and 15,659.96

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Solution

The fourth proportional to 28,406.80, 39,199.81 and 15,659.96 is: 21,609.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,406.80 : 39,199.81 = 15,659.96 : x
  2. Step 2: Convert to fraction form
    28,406.80/39,199.81 = 15,659.96/x
  3. Step 3: Cross multiply
    28,406.80x = 39,199.81 × 15,659.96
  4. Step 4: Simplify right side
    28,406.80x = 613,867,456.61
  5. Step 5: Solve for x
    x = 613,867,456.61/28,406.80
  6. Step 6: Final answer
    x = 21,609.88

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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.