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Finding the Fourth Proportional to 36,791.70, 55,114.65 and 20,121.90

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Solution

The fourth proportional to 36,791.70, 55,114.65 and 20,121.90 is: 30,142.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,791.70 : 55,114.65 = 20,121.90 : x
  2. Step 2: Convert to fraction form
    36,791.70/55,114.65 = 20,121.90/x
  3. Step 3: Cross multiply
    36,791.70x = 55,114.65 × 20,121.90
  4. Step 4: Simplify right side
    36,791.70x = 1,109,011,475.84
  5. Step 5: Solve for x
    x = 1,109,011,475.84/36,791.70
  6. Step 6: Final answer
    x = 30,142.98

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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.