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Finding the Fourth Proportional to 18,939.30, 28,375.20 and 11,539.92

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Solution

The fourth proportional to 18,939.30, 28,375.20 and 11,539.92 is: 17,289.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.30 : 28,375.20 = 11,539.92 : x
  2. Step 2: Convert to fraction form
    18,939.30/28,375.20 = 11,539.92/x
  3. Step 3: Cross multiply
    18,939.30x = 28,375.20 × 11,539.92
  4. Step 4: Simplify right side
    18,939.30x = 327,447,537.98
  5. Step 5: Solve for x
    x = 327,447,537.98/18,939.30
  6. Step 6: Final answer
    x = 17,289.32

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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.