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Finding the Fourth Proportional to 28,651.14, 42,978.72 and 11,994.36

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Solution

The fourth proportional to 28,651.14, 42,978.72 and 11,994.36 is: 17,992.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,651.14 : 42,978.72 = 11,994.36 : x
  2. Step 2: Convert to fraction form
    28,651.14/42,978.72 = 11,994.36/x
  3. Step 3: Cross multiply
    28,651.14x = 42,978.72 × 11,994.36
  4. Step 4: Simplify right side
    28,651.14x = 515,502,240.02
  5. Step 5: Solve for x
    x = 515,502,240.02/28,651.14
  6. Step 6: Final answer
    x = 17,992.38

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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.