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Finding the Fourth Proportional to 342,751.09, 513,791.05 and 143,128.56

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Solution

The fourth proportional to 342,751.09, 513,791.05 and 143,128.56 is: 214,552.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    342,751.09 : 513,791.05 = 143,128.56 : x
  2. Step 2: Convert to fraction form
    342,751.09/513,791.05 = 143,128.56/x
  3. Step 3: Cross multiply
    342,751.09x = 513,791.05 × 143,128.56
  4. Step 4: Simplify right side
    342,751.09x = 73,538,173,519.61
  5. Step 5: Solve for x
    x = 73,538,173,519.61/342,751.09
  6. Step 6: Final answer
    x = 214,552.71

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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.