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Finding the Fourth Proportional to 198,571.60, 297,910.20 and 86,203.60

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Solution

The fourth proportional to 198,571.60, 297,910.20 and 86,203.60 is: 129,328.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    198,571.60 : 297,910.20 = 86,203.60 : x
  2. Step 2: Convert to fraction form
    198,571.60/297,910.20 = 86,203.60/x
  3. Step 3: Cross multiply
    198,571.60x = 297,910.20 × 86,203.60
  4. Step 4: Simplify right side
    198,571.60x = 25,680,931,716.72
  5. Step 5: Solve for x
    x = 25,680,931,716.72/198,571.60
  6. Step 6: Final answer
    x = 129,328.32

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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.