Home / 20,228.20-30,309.90-12,819.40

Finding the Fourth Proportional to 20,228.20, 30,309.90 and 12,819.40

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Solution

The fourth proportional to 20,228.20, 30,309.90 and 12,819.40 is: 19,208.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,228.20 : 30,309.90 = 12,819.40 : x
  2. Step 2: Convert to fraction form
    20,228.20/30,309.90 = 12,819.40/x
  3. Step 3: Cross multiply
    20,228.20x = 30,309.90 × 12,819.40
  4. Step 4: Simplify right side
    20,228.20x = 388,554,732.06
  5. Step 5: Solve for x
    x = 388,554,732.06/20,228.20
  6. Step 6: Final answer
    x = 19,208.57

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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.