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Finding the Fourth Proportional to 245,129.15, 338,241.39 and 137,678.60

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Solution

The fourth proportional to 245,129.15, 338,241.39 and 137,678.60 is: 189,975.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,129.15 : 338,241.39 = 137,678.60 : x
  2. Step 2: Convert to fraction form
    245,129.15/338,241.39 = 137,678.60/x
  3. Step 3: Cross multiply
    245,129.15x = 338,241.39 × 137,678.60
  4. Step 4: Simplify right side
    245,129.15x = 46,568,601,037.25
  5. Step 5: Solve for x
    x = 46,568,601,037.25/245,129.15
  6. Step 6: Final answer
    x = 189,975.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.