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Finding the Fourth Proportional to 121,743.71, 168,005.97 and 68,028.78

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Solution

The fourth proportional to 121,743.71, 168,005.97 and 68,028.78 is: 93,879.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,743.71 : 168,005.97 = 68,028.78 : x
  2. Step 2: Convert to fraction form
    121,743.71/168,005.97 = 68,028.78/x
  3. Step 3: Cross multiply
    121,743.71x = 168,005.97 × 68,028.78
  4. Step 4: Simplify right side
    121,743.71x = 11,429,241,801.84
  5. Step 5: Solve for x
    x = 11,429,241,801.84/121,743.71
  6. Step 6: Final answer
    x = 93,879.52

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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.