Home / 28,186.20-42,251.49-12,399.75

Finding the Fourth Proportional to 28,186.20, 42,251.49 and 12,399.75

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Solution

The fourth proportional to 28,186.20, 42,251.49 and 12,399.75 is: 18,587.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,186.20 : 42,251.49 = 12,399.75 : x
  2. Step 2: Convert to fraction form
    28,186.20/42,251.49 = 12,399.75/x
  3. Step 3: Cross multiply
    28,186.20x = 42,251.49 × 12,399.75
  4. Step 4: Simplify right side
    28,186.20x = 523,907,913.13
  5. Step 5: Solve for x
    x = 523,907,913.13/28,186.20
  6. Step 6: Final answer
    x = 18,587.39

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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.