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Finding the Fourth Proportional to 121,046.81, 166,976.37 and 72,636.21

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Solution

The fourth proportional to 121,046.81, 166,976.37 and 72,636.21 is: 100,197.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,046.81 : 166,976.37 = 72,636.21 : x
  2. Step 2: Convert to fraction form
    121,046.81/166,976.37 = 72,636.21/x
  3. Step 3: Cross multiply
    121,046.81x = 166,976.37 × 72,636.21
  4. Step 4: Simplify right side
    121,046.81x = 12,128,530,676.36
  5. Step 5: Solve for x
    x = 12,128,530,676.36/121,046.81
  6. Step 6: Final answer
    x = 100,197.03

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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.