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Finding the Fourth Proportional to 199,913.73, 275,854.32 and 128,390.64

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Solution

The fourth proportional to 199,913.73, 275,854.32 and 128,390.64 is: 177,161.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    199,913.73 : 275,854.32 = 128,390.64 : x
  2. Step 2: Convert to fraction form
    199,913.73/275,854.32 = 128,390.64/x
  3. Step 3: Cross multiply
    199,913.73x = 275,854.32 × 128,390.64
  4. Step 4: Simplify right side
    199,913.73x = 35,417,112,691.56
  5. Step 5: Solve for x
    x = 35,417,112,691.56/199,913.73
  6. Step 6: Final answer
    x = 177,161.98

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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.