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Finding the Fourth Proportional to 30,212.65, 41,694.65 and 20,672.55

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Solution

The fourth proportional to 30,212.65, 41,694.65 and 20,672.55 is: 28,528.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,212.65 : 41,694.65 = 20,672.55 : x
  2. Step 2: Convert to fraction form
    30,212.65/41,694.65 = 20,672.55/x
  3. Step 3: Cross multiply
    30,212.65x = 41,694.65 × 20,672.55
  4. Step 4: Simplify right side
    30,212.65x = 861,934,736.86
  5. Step 5: Solve for x
    x = 861,934,736.86/30,212.65
  6. Step 6: Final answer
    x = 28,528.94

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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.