Home / 2,780.80-4,169.28-1,912.96

Finding the Fourth Proportional to 2,780.80, 4,169.28 and 1,912.96

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Solution

The fourth proportional to 2,780.80, 4,169.28 and 1,912.96 is: 2,868.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,780.80 : 4,169.28 = 1,912.96 : x
  2. Step 2: Convert to fraction form
    2,780.80/4,169.28 = 1,912.96/x
  3. Step 3: Cross multiply
    2,780.80x = 4,169.28 × 1,912.96
  4. Step 4: Simplify right side
    2,780.80x = 7,975,665.87
  5. Step 5: Solve for x
    x = 7,975,665.87/2,780.80
  6. Step 6: Final answer
    x = 2,868.12

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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.