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Finding the Fourth Proportional to 20,499.12, 30,751.92 and 8,812.80

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Solution

The fourth proportional to 20,499.12, 30,751.92 and 8,812.80 is: 13,220.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,499.12 : 30,751.92 = 8,812.80 : x
  2. Step 2: Convert to fraction form
    20,499.12/30,751.92 = 8,812.80/x
  3. Step 3: Cross multiply
    20,499.12x = 30,751.92 × 8,812.80
  4. Step 4: Simplify right side
    20,499.12x = 271,010,520.58
  5. Step 5: Solve for x
    x = 271,010,520.58/20,499.12
  6. Step 6: Final answer
    x = 13,220.59

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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.