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Finding the Fourth Proportional to 28,975.13, 39,978.82 and 16,399.88

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Solution

The fourth proportional to 28,975.13, 39,978.82 and 16,399.88 is: 22,627.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,975.13 : 39,978.82 = 16,399.88 : x
  2. Step 2: Convert to fraction form
    28,975.13/39,978.82 = 16,399.88/x
  3. Step 3: Cross multiply
    28,975.13x = 39,978.82 × 16,399.88
  4. Step 4: Simplify right side
    28,975.13x = 655,647,850.54
  5. Step 5: Solve for x
    x = 655,647,850.54/28,975.13
  6. Step 6: Final answer
    x = 22,627.95

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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.