Home / 3,421.20-5,136.60-2,125.20

Finding the Fourth Proportional to 3,421.20, 5,136.60 and 2,125.20

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Solution

The fourth proportional to 3,421.20, 5,136.60 and 2,125.20 is: 3,190.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,421.20 : 5,136.60 = 2,125.20 : x
  2. Step 2: Convert to fraction form
    3,421.20/5,136.60 = 2,125.20/x
  3. Step 3: Cross multiply
    3,421.20x = 5,136.60 × 2,125.20
  4. Step 4: Simplify right side
    3,421.20x = 10,916,302.32
  5. Step 5: Solve for x
    x = 10,916,302.32/3,421.20
  6. Step 6: Final answer
    x = 3,190.78

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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.