Home / 3,209.76-4,815.20-1,129.60

Finding the Fourth Proportional to 3,209.76, 4,815.20 and 1,129.60

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Solution

The fourth proportional to 3,209.76, 4,815.20 and 1,129.60 is: 1,694.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,209.76 : 4,815.20 = 1,129.60 : x
  2. Step 2: Convert to fraction form
    3,209.76/4,815.20 = 1,129.60/x
  3. Step 3: Cross multiply
    3,209.76x = 4,815.20 × 1,129.60
  4. Step 4: Simplify right side
    3,209.76x = 5,439,249.92
  5. Step 5: Solve for x
    x = 5,439,249.92/3,209.76
  6. Step 6: Final answer
    x = 1,694.60

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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.