Home / 3,412.20-5,115.90-1,331.40

Finding the Fourth Proportional to 3,412.20, 5,115.90 and 1,331.40

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Solution

The fourth proportional to 3,412.20, 5,115.90 and 1,331.40 is: 1,996.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.20 : 5,115.90 = 1,331.40 : x
  2. Step 2: Convert to fraction form
    3,412.20/5,115.90 = 1,331.40/x
  3. Step 3: Cross multiply
    3,412.20x = 5,115.90 × 1,331.40
  4. Step 4: Simplify right side
    3,412.20x = 6,811,309.26
  5. Step 5: Solve for x
    x = 6,811,309.26/3,412.20
  6. Step 6: Final answer
    x = 1,996.16

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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.