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Finding the Fourth Proportional to 73,290.72, 109,923.64 and 20,687.88

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Solution

The fourth proportional to 73,290.72, 109,923.64 and 20,687.88 is: 31,028.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,290.72 : 109,923.64 = 20,687.88 : x
  2. Step 2: Convert to fraction form
    73,290.72/109,923.64 = 20,687.88/x
  3. Step 3: Cross multiply
    73,290.72x = 109,923.64 × 20,687.88
  4. Step 4: Simplify right side
    73,290.72x = 2,274,087,073.48
  5. Step 5: Solve for x
    x = 2,274,087,073.48/73,290.72
  6. Step 6: Final answer
    x = 31,028.31

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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.