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Finding the Fourth Proportional to 83,905.20, 125,728.20 and 72,759.60

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Solution

The fourth proportional to 83,905.20, 125,728.20 and 72,759.60 is: 109,027.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,905.20 : 125,728.20 = 72,759.60 : x
  2. Step 2: Convert to fraction form
    83,905.20/125,728.20 = 72,759.60/x
  3. Step 3: Cross multiply
    83,905.20x = 125,728.20 × 72,759.60
  4. Step 4: Simplify right side
    83,905.20x = 9,147,933,540.72
  5. Step 5: Solve for x
    x = 9,147,933,540.72/83,905.20
  6. Step 6: Final answer
    x = 109,027.02

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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.