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Finding the Fourth Proportional to 132,321.60, 198,190.80 and 79,639.20

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Solution

The fourth proportional to 132,321.60, 198,190.80 and 79,639.20 is: 119,283.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    132,321.60 : 198,190.80 = 79,639.20 : x
  2. Step 2: Convert to fraction form
    132,321.60/198,190.80 = 79,639.20/x
  3. Step 3: Cross multiply
    132,321.60x = 198,190.80 × 79,639.20
  4. Step 4: Simplify right side
    132,321.60x = 15,783,756,759.36
  5. Step 5: Solve for x
    x = 15,783,756,759.36/132,321.60
  6. Step 6: Final answer
    x = 119,283.30

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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.