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Finding the Fourth Proportional to 73,288.72, 109,920.64 and 20,685.88

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Solution

The fourth proportional to 73,288.72, 109,920.64 and 20,685.88 is: 31,025.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,288.72 : 109,920.64 = 20,685.88 : x
  2. Step 2: Convert to fraction form
    73,288.72/109,920.64 = 20,685.88/x
  3. Step 3: Cross multiply
    73,288.72x = 109,920.64 × 20,685.88
  4. Step 4: Simplify right side
    73,288.72x = 2,273,805,168.56
  5. Step 5: Solve for x
    x = 2,273,805,168.56/73,288.72
  6. Step 6: Final answer
    x = 31,025.31

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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.