Home / 8,121.90-12,185.33-3,439.47

Finding the Fourth Proportional to 8,121.90, 12,185.33 and 3,439.47

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Solution

The fourth proportional to 8,121.90, 12,185.33 and 3,439.47 is: 5,160.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,121.90 : 12,185.33 = 3,439.47 : x
  2. Step 2: Convert to fraction form
    8,121.90/12,185.33 = 3,439.47/x
  3. Step 3: Cross multiply
    8,121.90x = 12,185.33 × 3,439.47
  4. Step 4: Simplify right side
    8,121.90x = 41,911,059.78
  5. Step 5: Solve for x
    x = 41,911,059.78/8,121.90
  6. Step 6: Final answer
    x = 5,160.25

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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.