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Finding the Fourth Proportional to 172,980.12, 259,481.13 and 73,121.70

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Solution

The fourth proportional to 172,980.12, 259,481.13 and 73,121.70 is: 109,687.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,980.12 : 259,481.13 = 73,121.70 : x
  2. Step 2: Convert to fraction form
    172,980.12/259,481.13 = 73,121.70/x
  3. Step 3: Cross multiply
    172,980.12x = 259,481.13 × 73,121.70
  4. Step 4: Simplify right side
    172,980.12x = 18,973,701,343.52
  5. Step 5: Solve for x
    x = 18,973,701,343.52/172,980.12
  6. Step 6: Final answer
    x = 109,687.18

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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.