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Finding the Fourth Proportional to 18,936.10, 28,402.20 and 8,406.31

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Solution

The fourth proportional to 18,936.10, 28,402.20 and 8,406.31 is: 12,608.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,936.10 : 28,402.20 = 8,406.31 : x
  2. Step 2: Convert to fraction form
    18,936.10/28,402.20 = 8,406.31/x
  3. Step 3: Cross multiply
    18,936.10x = 28,402.20 × 8,406.31
  4. Step 4: Simplify right side
    18,936.10x = 238,757,697.88
  5. Step 5: Solve for x
    x = 238,757,697.88/18,936.10
  6. Step 6: Final answer
    x = 12,608.60

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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.