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Finding the Fourth Proportional to 203,429.80, 305,144.70 and 128,780.20

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Solution

The fourth proportional to 203,429.80, 305,144.70 and 128,780.20 is: 193,170.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    203,429.80 : 305,144.70 = 128,780.20 : x
  2. Step 2: Convert to fraction form
    203,429.80/305,144.70 = 128,780.20/x
  3. Step 3: Cross multiply
    203,429.80x = 305,144.70 × 128,780.20
  4. Step 4: Simplify right side
    203,429.80x = 39,296,595,494.94
  5. Step 5: Solve for x
    x = 39,296,595,494.94/203,429.80
  6. Step 6: Final answer
    x = 193,170.30

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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.