Home / 2,213.79-3,320.70-809.21

Finding the Fourth Proportional to 2,213.79, 3,320.70 and 809.21

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Solution

The fourth proportional to 2,213.79, 3,320.70 and 809.21 is: 1,213.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,213.79 : 3,320.70 = 809.21 : x
  2. Step 2: Convert to fraction form
    2,213.79/3,320.70 = 809.21/x
  3. Step 3: Cross multiply
    2,213.79x = 3,320.70 × 809.21
  4. Step 4: Simplify right side
    2,213.79x = 2,687,143.65
  5. Step 5: Solve for x
    x = 2,687,143.65/2,213.79
  6. Step 6: Final answer
    x = 1,213.82

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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.