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Finding the Fourth Proportional to 28,651.11, 42,978.74 and 11,994.39

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Solution

The fourth proportional to 28,651.11, 42,978.74 and 11,994.39 is: 17,992.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,651.11 : 42,978.74 = 11,994.39 : x
  2. Step 2: Convert to fraction form
    28,651.11/42,978.74 = 11,994.39/x
  3. Step 3: Cross multiply
    28,651.11x = 42,978.74 × 11,994.39
  4. Step 4: Simplify right side
    28,651.11x = 515,503,709.30
  5. Step 5: Solve for x
    x = 515,503,709.30/28,651.11
  6. Step 6: Final answer
    x = 17,992.45

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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.