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Finding the Fourth Proportional to 80,830.80, 121,188.60 and 30,891.60

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Solution

The fourth proportional to 80,830.80, 121,188.60 and 30,891.60 is: 46,315.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,830.80 : 121,188.60 = 30,891.60 : x
  2. Step 2: Convert to fraction form
    80,830.80/121,188.60 = 30,891.60/x
  3. Step 3: Cross multiply
    80,830.80x = 121,188.60 × 30,891.60
  4. Step 4: Simplify right side
    80,830.80x = 3,743,709,755.76
  5. Step 5: Solve for x
    x = 3,743,709,755.76/80,830.80
  6. Step 6: Final answer
    x = 46,315.39

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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.