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Finding the Fourth Proportional to 172,989.48, 259,390.02 and 78,108.48

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Solution

The fourth proportional to 172,989.48, 259,390.02 and 78,108.48 is: 117,120.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,989.48 : 259,390.02 = 78,108.48 : x
  2. Step 2: Convert to fraction form
    172,989.48/259,390.02 = 78,108.48/x
  3. Step 3: Cross multiply
    172,989.48x = 259,390.02 × 78,108.48
  4. Step 4: Simplify right side
    172,989.48x = 20,260,560,189.37
  5. Step 5: Solve for x
    x = 20,260,560,189.37/172,989.48
  6. Step 6: Final answer
    x = 117,120.19

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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.