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Finding the Fourth Proportional to 121,930.20, 168,321.20 and 91,727.02

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Solution

The fourth proportional to 121,930.20, 168,321.20 and 91,727.02 is: 126,626.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,930.20 : 168,321.20 = 91,727.02 : x
  2. Step 2: Convert to fraction form
    121,930.20/168,321.20 = 91,727.02/x
  3. Step 3: Cross multiply
    121,930.20x = 168,321.20 × 91,727.02
  4. Step 4: Simplify right side
    121,930.20x = 15,439,602,078.82
  5. Step 5: Solve for x
    x = 15,439,602,078.82/121,930.20
  6. Step 6: Final answer
    x = 126,626.56

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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.