Home / 2,728.20-4,092.95-780.36

Finding the Fourth Proportional to 2,728.20, 4,092.95 and 780.36

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Solution

The fourth proportional to 2,728.20, 4,092.95 and 780.36 is: 1,170.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.20 : 4,092.95 = 780.36 : x
  2. Step 2: Convert to fraction form
    2,728.20/4,092.95 = 780.36/x
  3. Step 3: Cross multiply
    2,728.20x = 4,092.95 × 780.36
  4. Step 4: Simplify right side
    2,728.20x = 3,193,974.46
  5. Step 5: Solve for x
    x = 3,193,974.46/2,728.20
  6. Step 6: Final answer
    x = 1,170.73

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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.