Home / 1,028.20-1,540.38-686.44

Finding the Fourth Proportional to 1,028.20, 1,540.38 and 686.44

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Solution

The fourth proportional to 1,028.20, 1,540.38 and 686.44 is: 1,028.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.20 : 1,540.38 = 686.44 : x
  2. Step 2: Convert to fraction form
    1,028.20/1,540.38 = 686.44/x
  3. Step 3: Cross multiply
    1,028.20x = 1,540.38 × 686.44
  4. Step 4: Simplify right side
    1,028.20x = 1,057,378.45
  5. Step 5: Solve for x
    x = 1,057,378.45/1,028.20
  6. Step 6: Final answer
    x = 1,028.38

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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.