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Finding the Fourth Proportional to 20,909.28, 28,843.92 and 16,934.88

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Solution

The fourth proportional to 20,909.28, 28,843.92 and 16,934.88 is: 23,361.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,909.28 : 28,843.92 = 16,934.88 : x
  2. Step 2: Convert to fraction form
    20,909.28/28,843.92 = 16,934.88/x
  3. Step 3: Cross multiply
    20,909.28x = 28,843.92 × 16,934.88
  4. Step 4: Simplify right side
    20,909.28x = 488,468,323.93
  5. Step 5: Solve for x
    x = 488,468,323.93/20,909.28
  6. Step 6: Final answer
    x = 23,361.32

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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.