Home / 3,678.40-5,517.78-1,213.21

Finding the Fourth Proportional to 3,678.40, 5,517.78 and 1,213.21

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Solution

The fourth proportional to 3,678.40, 5,517.78 and 1,213.21 is: 1,819.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,678.40 : 5,517.78 = 1,213.21 : x
  2. Step 2: Convert to fraction form
    3,678.40/5,517.78 = 1,213.21/x
  3. Step 3: Cross multiply
    3,678.40x = 5,517.78 × 1,213.21
  4. Step 4: Simplify right side
    3,678.40x = 6,694,225.87
  5. Step 5: Solve for x
    x = 6,694,225.87/3,678.40
  6. Step 6: Final answer
    x = 1,819.87

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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.