Home / 20,380.20-28,124.70-11,427.72

Finding the Fourth Proportional to 20,380.20, 28,124.70 and 11,427.72

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Solution

The fourth proportional to 20,380.20, 28,124.70 and 11,427.72 is: 15,770.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,380.20 : 28,124.70 = 11,427.72 : x
  2. Step 2: Convert to fraction form
    20,380.20/28,124.70 = 11,427.72/x
  3. Step 3: Cross multiply
    20,380.20x = 28,124.70 × 11,427.72
  4. Step 4: Simplify right side
    20,380.20x = 321,401,196.68
  5. Step 5: Solve for x
    x = 321,401,196.68/20,380.20
  6. Step 6: Final answer
    x = 15,770.27

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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.