Home / 20,778.68-28,669.20-13,221.92

Finding the Fourth Proportional to 20,778.68, 28,669.20 and 13,221.92

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Solution

The fourth proportional to 20,778.68, 28,669.20 and 13,221.92 is: 18,242.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.68 : 28,669.20 = 13,221.92 : x
  2. Step 2: Convert to fraction form
    20,778.68/28,669.20 = 13,221.92/x
  3. Step 3: Cross multiply
    20,778.68x = 28,669.20 × 13,221.92
  4. Step 4: Simplify right side
    20,778.68x = 379,061,868.86
  5. Step 5: Solve for x
    x = 379,061,868.86/20,778.68
  6. Step 6: Final answer
    x = 18,242.83

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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.