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Finding the Fourth Proportional to 36,791.20, 55,113.90 and 20,121.40

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Solution

The fourth proportional to 36,791.20, 55,113.90 and 20,121.40 is: 30,142.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    36,791.20 : 55,113.90 = 20,121.40 : x
  2. Step 2: Convert to fraction form
    36,791.20/55,113.90 = 20,121.40/x
  3. Step 3: Cross multiply
    36,791.20x = 55,113.90 × 20,121.40
  4. Step 4: Simplify right side
    36,791.20x = 1,108,968,827.46
  5. Step 5: Solve for x
    x = 1,108,968,827.46/36,791.20
  6. Step 6: Final answer
    x = 30,142.23

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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.