Home / 20,396.28-28,153.89-12,855.33

Finding the Fourth Proportional to 20,396.28, 28,153.89 and 12,855.33

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Solution

The fourth proportional to 20,396.28, 28,153.89 and 12,855.33 is: 17,744.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,396.28 : 28,153.89 = 12,855.33 : x
  2. Step 2: Convert to fraction form
    20,396.28/28,153.89 = 12,855.33/x
  3. Step 3: Cross multiply
    20,396.28x = 28,153.89 × 12,855.33
  4. Step 4: Simplify right side
    20,396.28x = 361,927,546.73
  5. Step 5: Solve for x
    x = 361,927,546.73/20,396.28
  6. Step 6: Final answer
    x = 17,744.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.