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Finding the Fourth Proportional to 172,731.36, 259,131.96 and 72,891.78

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Solution

The fourth proportional to 172,731.36, 259,131.96 and 72,891.78 is: 109,352.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,731.36 : 259,131.96 = 72,891.78 : x
  2. Step 2: Convert to fraction form
    172,731.36/259,131.96 = 72,891.78/x
  3. Step 3: Cross multiply
    172,731.36x = 259,131.96 × 72,891.78
  4. Step 4: Simplify right side
    172,731.36x = 18,888,589,819.29
  5. Step 5: Solve for x
    x = 18,888,589,819.29/172,731.36
  6. Step 6: Final answer
    x = 109,352.41

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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.