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Finding the Fourth Proportional to 129,991.20, 195,132.60 and 100,539.60

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Solution

The fourth proportional to 129,991.20, 195,132.60 and 100,539.60 is: 150,922.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,991.20 : 195,132.60 = 100,539.60 : x
  2. Step 2: Convert to fraction form
    129,991.20/195,132.60 = 100,539.60/x
  3. Step 3: Cross multiply
    129,991.20x = 195,132.60 × 100,539.60
  4. Step 4: Simplify right side
    129,991.20x = 19,618,553,550.96
  5. Step 5: Solve for x
    x = 19,618,553,550.96/129,991.20
  6. Step 6: Final answer
    x = 150,922.17

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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.