Home / 3,809.92-5,715.52-1,212.80

Finding the Fourth Proportional to 3,809.92, 5,715.52 and 1,212.80

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Solution

The fourth proportional to 3,809.92, 5,715.52 and 1,212.80 is: 1,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,809.92 : 5,715.52 = 1,212.80 : x
  2. Step 2: Convert to fraction form
    3,809.92/5,715.52 = 1,212.80/x
  3. Step 3: Cross multiply
    3,809.92x = 5,715.52 × 1,212.80
  4. Step 4: Simplify right side
    3,809.92x = 6,931,782.66
  5. Step 5: Solve for x
    x = 6,931,782.66/3,809.92
  6. Step 6: Final answer
    x = 1,819.40

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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.