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Finding the Fourth Proportional to 111,791.52, 154,255.32 and 63,390.78

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Solution

The fourth proportional to 111,791.52, 154,255.32 and 63,390.78 is: 87,469.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    111,791.52 : 154,255.32 = 63,390.78 : x
  2. Step 2: Convert to fraction form
    111,791.52/154,255.32 = 63,390.78/x
  3. Step 3: Cross multiply
    111,791.52x = 154,255.32 × 63,390.78
  4. Step 4: Simplify right side
    111,791.52x = 9,778,365,053.95
  5. Step 5: Solve for x
    x = 9,778,365,053.95/111,791.52
  6. Step 6: Final answer
    x = 87,469.65

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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.