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Finding the Fourth Proportional to 20,762.88, 28,651.86 and 11,811.12

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Solution

The fourth proportional to 20,762.88, 28,651.86 and 11,811.12 is: 16,298.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,762.88 : 28,651.86 = 11,811.12 : x
  2. Step 2: Convert to fraction form
    20,762.88/28,651.86 = 11,811.12/x
  3. Step 3: Cross multiply
    20,762.88x = 28,651.86 × 11,811.12
  4. Step 4: Simplify right side
    20,762.88x = 338,410,556.68
  5. Step 5: Solve for x
    x = 338,410,556.68/20,762.88
  6. Step 6: Final answer
    x = 16,298.83

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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.