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Finding the Fourth Proportional to 57,921.20, 87,067.40 and 53,812.40

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Solution

The fourth proportional to 57,921.20, 87,067.40 and 53,812.40 is: 80,891.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    57,921.20 : 87,067.40 = 53,812.40 : x
  2. Step 2: Convert to fraction form
    57,921.20/87,067.40 = 53,812.40/x
  3. Step 3: Cross multiply
    57,921.20x = 87,067.40 × 53,812.40
  4. Step 4: Simplify right side
    57,921.20x = 4,685,305,755.76
  5. Step 5: Solve for x
    x = 4,685,305,755.76/57,921.20
  6. Step 6: Final answer
    x = 80,891.03

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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.