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Finding the Fourth Proportional to 125,945.20, 189,063.60 and 72,679.60

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Solution

The fourth proportional to 125,945.20, 189,063.60 and 72,679.60 is: 109,103.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    125,945.20 : 189,063.60 = 72,679.60 : x
  2. Step 2: Convert to fraction form
    125,945.20/189,063.60 = 72,679.60/x
  3. Step 3: Cross multiply
    125,945.20x = 189,063.60 × 72,679.60
  4. Step 4: Simplify right side
    125,945.20x = 13,741,066,822.56
  5. Step 5: Solve for x
    x = 13,741,066,822.56/125,945.20
  6. Step 6: Final answer
    x = 109,103.54

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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.