Home / 20,824.80-31,245.30-9,129.78

Finding the Fourth Proportional to 20,824.80, 31,245.30 and 9,129.78

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Solution

The fourth proportional to 20,824.80, 31,245.30 and 9,129.78 is: 13,698.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,824.80 : 31,245.30 = 9,129.78 : x
  2. Step 2: Convert to fraction form
    20,824.80/31,245.30 = 9,129.78/x
  3. Step 3: Cross multiply
    20,824.80x = 31,245.30 × 9,129.78
  4. Step 4: Simplify right side
    20,824.80x = 285,262,715.03
  5. Step 5: Solve for x
    x = 285,262,715.03/20,824.80
  6. Step 6: Final answer
    x = 13,698.22

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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.