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Finding the Fourth Proportional to 5,428.60, 8,139.60 and 2,137.90

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Solution

The fourth proportional to 5,428.60, 8,139.60 and 2,137.90 is: 3,205.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,428.60 : 8,139.60 = 2,137.90 : x
  2. Step 2: Convert to fraction form
    5,428.60/8,139.60 = 2,137.90/x
  3. Step 3: Cross multiply
    5,428.60x = 8,139.60 × 2,137.90
  4. Step 4: Simplify right side
    5,428.60x = 17,401,650.84
  5. Step 5: Solve for x
    x = 17,401,650.84/5,428.60
  6. Step 6: Final answer
    x = 3,205.55

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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.