Home / 20,212.20-30,318.30-7,900.20

Finding the Fourth Proportional to 20,212.20, 30,318.30 and 7,900.20

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Solution

The fourth proportional to 20,212.20, 30,318.30 and 7,900.20 is: 11,850.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,212.20 : 30,318.30 = 7,900.20 : x
  2. Step 2: Convert to fraction form
    20,212.20/30,318.30 = 7,900.20/x
  3. Step 3: Cross multiply
    20,212.20x = 30,318.30 × 7,900.20
  4. Step 4: Simplify right side
    20,212.20x = 239,520,633.66
  5. Step 5: Solve for x
    x = 239,520,633.66/20,212.20
  6. Step 6: Final answer
    x = 11,850.30

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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.