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Finding the Fourth Proportional to 73,121.34, 109,665.80 and 20,529.66

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Solution

The fourth proportional to 73,121.34, 109,665.80 and 20,529.66 is: 30,789.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,121.34 : 109,665.80 = 20,529.66 : x
  2. Step 2: Convert to fraction form
    73,121.34/109,665.80 = 20,529.66/x
  3. Step 3: Cross multiply
    73,121.34x = 109,665.80 × 20,529.66
  4. Step 4: Simplify right side
    73,121.34x = 2,251,401,587.63
  5. Step 5: Solve for x
    x = 2,251,401,587.63/73,121.34
  6. Step 6: Final answer
    x = 30,789.94

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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.