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Finding the Fourth Proportional to 78,821.88, 118,197.72 and 28,888.80

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Solution

The fourth proportional to 78,821.88, 118,197.72 and 28,888.80 is: 43,320.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,821.88 : 118,197.72 = 28,888.80 : x
  2. Step 2: Convert to fraction form
    78,821.88/118,197.72 = 28,888.80/x
  3. Step 3: Cross multiply
    78,821.88x = 118,197.72 × 28,888.80
  4. Step 4: Simplify right side
    78,821.88x = 3,414,590,293.54
  5. Step 5: Solve for x
    x = 3,414,590,293.54/78,821.88
  6. Step 6: Final answer
    x = 43,320.34

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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.