Home / 1,912.76-2,869.18-680.20

Finding the Fourth Proportional to 1,912.76, 2,869.18 and 680.20

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Solution

The fourth proportional to 1,912.76, 2,869.18 and 680.20 is: 1,020.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,912.76 : 2,869.18 = 680.20 : x
  2. Step 2: Convert to fraction form
    1,912.76/2,869.18 = 680.20/x
  3. Step 3: Cross multiply
    1,912.76x = 2,869.18 × 680.20
  4. Step 4: Simplify right side
    1,912.76x = 1,951,616.24
  5. Step 5: Solve for x
    x = 1,951,616.24/1,912.76
  6. Step 6: Final answer
    x = 1,020.31

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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.