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Finding the Fourth Proportional to 198,999.20, 297,721.20 and 129,015.20

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Solution

The fourth proportional to 198,999.20, 297,721.20 and 129,015.20 is: 193,018.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,999.20 : 297,721.20 = 129,015.20 : x
  2. Step 2: Convert to fraction form
    198,999.20/297,721.20 = 129,015.20/x
  3. Step 3: Cross multiply
    198,999.20x = 297,721.20 × 129,015.20
  4. Step 4: Simplify right side
    198,999.20x = 38,410,560,162.24
  5. Step 5: Solve for x
    x = 38,410,560,162.24/198,999.20
  6. Step 6: Final answer
    x = 193,018.67

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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.