Home / 20,821.88-28,734.20-11,390.44

Finding the Fourth Proportional to 20,821.88, 28,734.20 and 11,390.44

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Solution

The fourth proportional to 20,821.88, 28,734.20 and 11,390.44 is: 15,718.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.88 : 28,734.20 = 11,390.44 : x
  2. Step 2: Convert to fraction form
    20,821.88/28,734.20 = 11,390.44/x
  3. Step 3: Cross multiply
    20,821.88x = 28,734.20 × 11,390.44
  4. Step 4: Simplify right side
    20,821.88x = 327,295,181.05
  5. Step 5: Solve for x
    x = 327,295,181.05/20,821.88
  6. Step 6: Final answer
    x = 15,718.81

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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.