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Finding the Fourth Proportional to 30,791.43, 42,490.04 and 18,213.75

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Solution

The fourth proportional to 30,791.43, 42,490.04 and 18,213.75 is: 25,133.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,791.43 : 42,490.04 = 18,213.75 : x
  2. Step 2: Convert to fraction form
    30,791.43/42,490.04 = 18,213.75/x
  3. Step 3: Cross multiply
    30,791.43x = 42,490.04 × 18,213.75
  4. Step 4: Simplify right side
    30,791.43x = 773,902,874.98
  5. Step 5: Solve for x
    x = 773,902,874.98/30,791.43
  6. Step 6: Final answer
    x = 25,133.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.