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Finding the Fourth Proportional to 18,992.86, 28,499.49 and 7,907.20

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Solution

The fourth proportional to 18,992.86, 28,499.49 and 7,907.20 is: 11,865.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.86 : 28,499.49 = 7,907.20 : x
  2. Step 2: Convert to fraction form
    18,992.86/28,499.49 = 7,907.20/x
  3. Step 3: Cross multiply
    18,992.86x = 28,499.49 × 7,907.20
  4. Step 4: Simplify right side
    18,992.86x = 225,351,167.33
  5. Step 5: Solve for x
    x = 225,351,167.33/18,992.86
  6. Step 6: Final answer
    x = 11,865.05

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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.