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Finding the Fourth Proportional to 199,978.38, 276,039.66 and 115,129.26

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Solution

The fourth proportional to 199,978.38, 276,039.66 and 115,129.26 is: 158,918.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,978.38 : 276,039.66 = 115,129.26 : x
  2. Step 2: Convert to fraction form
    199,978.38/276,039.66 = 115,129.26/x
  3. Step 3: Cross multiply
    199,978.38x = 276,039.66 × 115,129.26
  4. Step 4: Simplify right side
    199,978.38x = 31,780,241,786.45
  5. Step 5: Solve for x
    x = 31,780,241,786.45/199,978.38
  6. Step 6: Final answer
    x = 158,918.39

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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.