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Finding the Fourth Proportional to 78,991.89, 118,536.44 and 71,609.55

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Solution

The fourth proportional to 78,991.89, 118,536.44 and 71,609.55 is: 107,458.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,991.89 : 118,536.44 = 71,609.55 : x
  2. Step 2: Convert to fraction form
    78,991.89/118,536.44 = 71,609.55/x
  3. Step 3: Cross multiply
    78,991.89x = 118,536.44 × 71,609.55
  4. Step 4: Simplify right side
    78,991.89x = 8,488,340,768.95
  5. Step 5: Solve for x
    x = 8,488,340,768.95/78,991.89
  6. Step 6: Final answer
    x = 107,458.38

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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.