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Finding the Fourth Proportional to 339,435.81, 509,219.28 and 129,057.39

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Solution

The fourth proportional to 339,435.81, 509,219.28 and 129,057.39 is: 193,611.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,435.81 : 509,219.28 = 129,057.39 : x
  2. Step 2: Convert to fraction form
    339,435.81/509,219.28 = 129,057.39/x
  3. Step 3: Cross multiply
    339,435.81x = 509,219.28 × 129,057.39
  4. Step 4: Simplify right side
    339,435.81x = 65,718,511,214.48
  5. Step 5: Solve for x
    x = 65,718,511,214.48/339,435.81
  6. Step 6: Final answer
    x = 193,611.01

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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.