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Finding the Fourth Proportional to 18,768.20, 28,135.02 and 8,912.12

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Solution

The fourth proportional to 18,768.20, 28,135.02 and 8,912.12 is: 13,359.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,768.20 : 28,135.02 = 8,912.12 : x
  2. Step 2: Convert to fraction form
    18,768.20/28,135.02 = 8,912.12/x
  3. Step 3: Cross multiply
    18,768.20x = 28,135.02 × 8,912.12
  4. Step 4: Simplify right side
    18,768.20x = 250,742,674.44
  5. Step 5: Solve for x
    x = 250,742,674.44/18,768.20
  6. Step 6: Final answer
    x = 13,359.97

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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.