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Finding the Fourth Proportional to 245,378, 338,618.40 and 136,481.60

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Solution

The fourth proportional to 245,378, 338,618.40 and 136,481.60 is: 188,342.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    245,378 : 338,618.40 = 136,481.60 : x
  2. Step 2: Convert to fraction form
    245,378/338,618.40 = 136,481.60/x
  3. Step 3: Cross multiply
    245,378x = 338,618.40 × 136,481.60
  4. Step 4: Simplify right side
    245,378x = 46,215,181,021.44
  5. Step 5: Solve for x
    x = 46,215,181,021.44/245,378
  6. Step 6: Final answer
    x = 188,342.81

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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.