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Finding the Fourth Proportional to 71,685.60, 107,614.80 and 40,120.80

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Solution

The fourth proportional to 71,685.60, 107,614.80 and 40,120.80 is: 60,229.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,685.60 : 107,614.80 = 40,120.80 : x
  2. Step 2: Convert to fraction form
    71,685.60/107,614.80 = 40,120.80/x
  3. Step 3: Cross multiply
    71,685.60x = 107,614.80 × 40,120.80
  4. Step 4: Simplify right side
    71,685.60x = 4,317,591,867.84
  5. Step 5: Solve for x
    x = 4,317,591,867.84/71,685.60
  6. Step 6: Final answer
    x = 60,229.56

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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.