Home / 3,121.90-4,680.50-1,889.06

Finding the Fourth Proportional to 3,121.90, 4,680.50 and 1,889.06

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Solution

The fourth proportional to 3,121.90, 4,680.50 and 1,889.06 is: 2,832.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121.90 : 4,680.50 = 1,889.06 : x
  2. Step 2: Convert to fraction form
    3,121.90/4,680.50 = 1,889.06/x
  3. Step 3: Cross multiply
    3,121.90x = 4,680.50 × 1,889.06
  4. Step 4: Simplify right side
    3,121.90x = 8,841,745.33
  5. Step 5: Solve for x
    x = 8,841,745.33/3,121.90
  6. Step 6: Final answer
    x = 2,832.17

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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.