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Finding the Fourth Proportional to 18,940.28, 28,407.68 and 5,789.12

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Solution

The fourth proportional to 18,940.28, 28,407.68 and 5,789.12 is: 8,682.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,940.28 : 28,407.68 = 5,789.12 : x
  2. Step 2: Convert to fraction form
    18,940.28/28,407.68 = 5,789.12/x
  3. Step 3: Cross multiply
    18,940.28x = 28,407.68 × 5,789.12
  4. Step 4: Simplify right side
    18,940.28x = 164,455,468.44
  5. Step 5: Solve for x
    x = 164,455,468.44/18,940.28
  6. Step 6: Final answer
    x = 8,682.84

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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.