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Finding the Fourth Proportional to 136,788.48, 188,768.88 and 80,200.80

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Solution

The fourth proportional to 136,788.48, 188,768.88 and 80,200.80 is: 110,677.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,788.48 : 188,768.88 = 80,200.80 : x
  2. Step 2: Convert to fraction form
    136,788.48/188,768.88 = 80,200.80/x
  3. Step 3: Cross multiply
    136,788.48x = 188,768.88 × 80,200.80
  4. Step 4: Simplify right side
    136,788.48x = 15,139,415,191.10
  5. Step 5: Solve for x
    x = 15,139,415,191.10/136,788.48
  6. Step 6: Final answer
    x = 110,677.56

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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.