Home / 20,811.22-31,202.24-7,661.88

Finding the Fourth Proportional to 20,811.22, 31,202.24 and 7,661.88

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Solution

The fourth proportional to 20,811.22, 31,202.24 and 7,661.88 is: 11,487.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.22 : 31,202.24 = 7,661.88 : x
  2. Step 2: Convert to fraction form
    20,811.22/31,202.24 = 7,661.88/x
  3. Step 3: Cross multiply
    20,811.22x = 31,202.24 × 7,661.88
  4. Step 4: Simplify right side
    20,811.22x = 239,067,818.61
  5. Step 5: Solve for x
    x = 239,067,818.61/20,811.22
  6. Step 6: Final answer
    x = 11,487.45

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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.