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Finding the Fourth Proportional to 81,449.69, 122,190.84 and 28,143.62

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Solution

The fourth proportional to 81,449.69, 122,190.84 and 28,143.62 is: 42,221.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,449.69 : 122,190.84 = 28,143.62 : x
  2. Step 2: Convert to fraction form
    81,449.69/122,190.84 = 28,143.62/x
  3. Step 3: Cross multiply
    81,449.69x = 122,190.84 × 28,143.62
  4. Step 4: Simplify right side
    81,449.69x = 3,438,892,415.70
  5. Step 5: Solve for x
    x = 3,438,892,415.70/81,449.69
  6. Step 6: Final answer
    x = 42,221.06

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1.5x scale

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.