Home / 2,810.70-4,212.63-1,989.21

Finding the Fourth Proportional to 2,810.70, 4,212.63 and 1,989.21

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Solution

The fourth proportional to 2,810.70, 4,212.63 and 1,989.21 is: 2,981.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,810.70 : 4,212.63 = 1,989.21 : x
  2. Step 2: Convert to fraction form
    2,810.70/4,212.63 = 1,989.21/x
  3. Step 3: Cross multiply
    2,810.70x = 4,212.63 × 1,989.21
  4. Step 4: Simplify right side
    2,810.70x = 8,379,805.72
  5. Step 5: Solve for x
    x = 8,379,805.72/2,810.70
  6. Step 6: Final answer
    x = 2,981.39

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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.