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Finding the Fourth Proportional to 203,983.60, 306,040.20 and 91,620.40

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Solution

The fourth proportional to 203,983.60, 306,040.20 and 91,620.40 is: 137,459.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,983.60 : 306,040.20 = 91,620.40 : x
  2. Step 2: Convert to fraction form
    203,983.60/306,040.20 = 91,620.40/x
  3. Step 3: Cross multiply
    203,983.60x = 306,040.20 × 91,620.40
  4. Step 4: Simplify right side
    203,983.60x = 28,039,525,540.08
  5. Step 5: Solve for x
    x = 28,039,525,540.08/203,983.60
  6. Step 6: Final answer
    x = 137,459.71

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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.