Home / 5,428.20-8,138.65-2,139.60

Finding the Fourth Proportional to 5,428.20, 8,138.65 and 2,139.60

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Solution

The fourth proportional to 5,428.20, 8,138.65 and 2,139.60 is: 3,207.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.20 : 8,138.65 = 2,139.60 : x
  2. Step 2: Convert to fraction form
    5,428.20/8,138.65 = 2,139.60/x
  3. Step 3: Cross multiply
    5,428.20x = 8,138.65 × 2,139.60
  4. Step 4: Simplify right side
    5,428.20x = 17,413,455.54
  5. Step 5: Solve for x
    x = 17,413,455.54/5,428.20
  6. Step 6: Final answer
    x = 3,207.96

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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.