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Finding the Fourth Proportional to 199,889.78, 275,821.25 and 128,366.69

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Solution

The fourth proportional to 199,889.78, 275,821.25 and 128,366.69 is: 177,128.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,889.78 : 275,821.25 = 128,366.69 : x
  2. Step 2: Convert to fraction form
    199,889.78/275,821.25 = 128,366.69/x
  3. Step 3: Cross multiply
    199,889.78x = 275,821.25 × 128,366.69
  4. Step 4: Simplify right side
    199,889.78x = 35,406,258,873.22
  5. Step 5: Solve for x
    x = 35,406,258,873.22/199,889.78
  6. Step 6: Final answer
    x = 177,128.91

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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.