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Finding the Fourth Proportional to 309,138.80, 428,794.12 and 300,944.84

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Solution

The fourth proportional to 309,138.80, 428,794.12 and 300,944.84 is: 417,428.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,138.80 : 428,794.12 = 300,944.84 : x
  2. Step 2: Convert to fraction form
    309,138.80/428,794.12 = 300,944.84/x
  3. Step 3: Cross multiply
    309,138.80x = 428,794.12 × 300,944.84
  4. Step 4: Simplify right side
    309,138.80x = 129,043,376,068.55
  5. Step 5: Solve for x
    x = 129,043,376,068.55/309,138.80
  6. Step 6: Final answer
    x = 417,428.61

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These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.