Home / 3,412.80-5,119.20-1,221.60

Finding the Fourth Proportional to 3,412.80, 5,119.20 and 1,221.60

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Solution

The fourth proportional to 3,412.80, 5,119.20 and 1,221.60 is: 1,832.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,412.80 : 5,119.20 = 1,221.60 : x
  2. Step 2: Convert to fraction form
    3,412.80/5,119.20 = 1,221.60/x
  3. Step 3: Cross multiply
    3,412.80x = 5,119.20 × 1,221.60
  4. Step 4: Simplify right side
    3,412.80x = 6,253,614.72
  5. Step 5: Solve for x
    x = 6,253,614.72/3,412.80
  6. Step 6: Final answer
    x = 1,832.40

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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.