Home / 20,809.92-31,231.28-9,131.20

Finding the Fourth Proportional to 20,809.92, 31,231.28 and 9,131.20

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Solution

The fourth proportional to 20,809.92, 31,231.28 and 9,131.20 is: 13,704.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,809.92 : 31,231.28 = 9,131.20 : x
  2. Step 2: Convert to fraction form
    20,809.92/31,231.28 = 9,131.20/x
  3. Step 3: Cross multiply
    20,809.92x = 31,231.28 × 9,131.20
  4. Step 4: Simplify right side
    20,809.92x = 285,179,063.94
  5. Step 5: Solve for x
    x = 285,179,063.94/20,809.92
  6. Step 6: Final answer
    x = 13,704.00

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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.