Home / 12,138.75-18,208.91-3,819.08

Finding the Fourth Proportional to 12,138.75, 18,208.91 and 3,819.08

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Solution

The fourth proportional to 12,138.75, 18,208.91 and 3,819.08 is: 5,728.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.75 : 18,208.91 = 3,819.08 : x
  2. Step 2: Convert to fraction form
    12,138.75/18,208.91 = 3,819.08/x
  3. Step 3: Cross multiply
    12,138.75x = 18,208.91 × 3,819.08
  4. Step 4: Simplify right side
    12,138.75x = 69,541,173.86
  5. Step 5: Solve for x
    x = 69,541,173.86/12,138.75
  6. Step 6: Final answer
    x = 5,728.86

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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.