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Finding the Fourth Proportional to 203,486.80, 305,019.60 and 91,220.80

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Solution

The fourth proportional to 203,486.80, 305,019.60 and 91,220.80 is: 136,736.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,486.80 : 305,019.60 = 91,220.80 : x
  2. Step 2: Convert to fraction form
    203,486.80/305,019.60 = 91,220.80/x
  3. Step 3: Cross multiply
    203,486.80x = 305,019.60 × 91,220.80
  4. Step 4: Simplify right side
    203,486.80x = 27,824,131,927.68
  5. Step 5: Solve for x
    x = 27,824,131,927.68/203,486.80
  6. Step 6: Final answer
    x = 136,736.79

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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.