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Finding the Fourth Proportional to 198,378.78, 297,438.84 and 71,995.20

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Solution

The fourth proportional to 198,378.78, 297,438.84 and 71,995.20 is: 107,945.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,378.78 : 297,438.84 = 71,995.20 : x
  2. Step 2: Convert to fraction form
    198,378.78/297,438.84 = 71,995.20/x
  3. Step 3: Cross multiply
    198,378.78x = 297,438.84 × 71,995.20
  4. Step 4: Simplify right side
    198,378.78x = 21,414,168,773.57
  5. Step 5: Solve for x
    x = 21,414,168,773.57/198,378.78
  6. Step 6: Final answer
    x = 107,945.86

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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.