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Finding the Fourth Proportional to 203,699.80, 305,780.10 and 120,640.60

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Solution

The fourth proportional to 203,699.80, 305,780.10 and 120,640.60 is: 181,097.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,699.80 : 305,780.10 = 120,640.60 : x
  2. Step 2: Convert to fraction form
    203,699.80/305,780.10 = 120,640.60/x
  3. Step 3: Cross multiply
    203,699.80x = 305,780.10 × 120,640.60
  4. Step 4: Simplify right side
    203,699.80x = 36,889,494,732.06
  5. Step 5: Solve for x
    x = 36,889,494,732.06/203,699.80
  6. Step 6: Final answer
    x = 181,097.35

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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.