Home / 5,428.20-8,142.30-1,324.20

Finding the Fourth Proportional to 5,428.20, 8,142.30 and 1,324.20

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Solution

The fourth proportional to 5,428.20, 8,142.30 and 1,324.20 is: 1,986.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.20 : 8,142.30 = 1,324.20 : x
  2. Step 2: Convert to fraction form
    5,428.20/8,142.30 = 1,324.20/x
  3. Step 3: Cross multiply
    5,428.20x = 8,142.30 × 1,324.20
  4. Step 4: Simplify right side
    5,428.20x = 10,782,033.66
  5. Step 5: Solve for x
    x = 10,782,033.66/5,428.20
  6. Step 6: Final answer
    x = 1,986.30

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1.5x scale

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.