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Finding the Fourth Proportional to 83,611.20, 125,416.80 and 79,723.20

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Solution

The fourth proportional to 83,611.20, 125,416.80 and 79,723.20 is: 119,584.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,611.20 : 125,416.80 = 79,723.20 : x
  2. Step 2: Convert to fraction form
    83,611.20/125,416.80 = 79,723.20/x
  3. Step 3: Cross multiply
    83,611.20x = 125,416.80 × 79,723.20
  4. Step 4: Simplify right side
    83,611.20x = 9,998,628,629.76
  5. Step 5: Solve for x
    x = 9,998,628,629.76/83,611.20
  6. Step 6: Final answer
    x = 119,584.80

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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.