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Finding the Fourth Proportional to 78,687.52, 118,014.88 and 28,791.12

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Solution

The fourth proportional to 78,687.52, 118,014.88 and 28,791.12 is: 43,180.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,687.52 : 118,014.88 = 28,791.12 : x
  2. Step 2: Convert to fraction form
    78,687.52/118,014.88 = 28,791.12/x
  3. Step 3: Cross multiply
    78,687.52x = 118,014.88 × 28,791.12
  4. Step 4: Simplify right side
    78,687.52x = 3,397,780,571.87
  5. Step 5: Solve for x
    x = 3,397,780,571.87/78,687.52
  6. Step 6: Final answer
    x = 43,180.68

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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.