Home / 131,107.20-196,660.80-78,489.60

Finding the Fourth Proportional to 131,107.20, 196,660.80 and 78,489.60

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Solution

The fourth proportional to 131,107.20, 196,660.80 and 78,489.60 is: 117,734.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,107.20 : 196,660.80 = 78,489.60 : x
  2. Step 2: Convert to fraction form
    131,107.20/196,660.80 = 78,489.60/x
  3. Step 3: Cross multiply
    131,107.20x = 196,660.80 × 78,489.60
  4. Step 4: Simplify right side
    131,107.20x = 15,435,827,527.68
  5. Step 5: Solve for x
    x = 15,435,827,527.68/131,107.20
  6. Step 6: Final answer
    x = 117,734.40

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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.