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Finding the Fourth Proportional to 131,449.60, 196,720.80 and 78,896.80

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Solution

The fourth proportional to 131,449.60, 196,720.80 and 78,896.80 is: 118,072.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,449.60 : 196,720.80 = 78,896.80 : x
  2. Step 2: Convert to fraction form
    131,449.60/196,720.80 = 78,896.80/x
  3. Step 3: Cross multiply
    131,449.60x = 196,720.80 × 78,896.80
  4. Step 4: Simplify right side
    131,449.60x = 15,520,641,613.44
  5. Step 5: Solve for x
    x = 15,520,641,613.44/131,449.60
  6. Step 6: Final answer
    x = 118,072.95

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1.5x scale

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.