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Finding the Fourth Proportional to 20,893.68, 28,818.48 and 12,939.84

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Solution

The fourth proportional to 20,893.68, 28,818.48 and 12,939.84 is: 17,847.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,893.68 : 28,818.48 = 12,939.84 : x
  2. Step 2: Convert to fraction form
    20,893.68/28,818.48 = 12,939.84/x
  3. Step 3: Cross multiply
    20,893.68x = 28,818.48 × 12,939.84
  4. Step 4: Simplify right side
    20,893.68x = 372,906,520.24
  5. Step 5: Solve for x
    x = 372,906,520.24/20,893.68
  6. Step 6: Final answer
    x = 17,847.81

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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.