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Finding the Fourth Proportional to 218,645.28, 327,758.76 and 85,481.28

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Solution

The fourth proportional to 218,645.28, 327,758.76 and 85,481.28 is: 128,140.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,645.28 : 327,758.76 = 85,481.28 : x
  2. Step 2: Convert to fraction form
    218,645.28/327,758.76 = 85,481.28/x
  3. Step 3: Cross multiply
    218,645.28x = 327,758.76 × 85,481.28
  4. Step 4: Simplify right side
    218,645.28x = 28,017,238,336.01
  5. Step 5: Solve for x
    x = 28,017,238,336.01/218,645.28
  6. Step 6: Final answer
    x = 128,140.15

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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.