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Finding the Fourth Proportional to 121,040.72, 166,918.92 and 80,756.12

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Solution

The fourth proportional to 121,040.72, 166,918.92 and 80,756.12 is: 111,365.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,040.72 : 166,918.92 = 80,756.12 : x
  2. Step 2: Convert to fraction form
    121,040.72/166,918.92 = 80,756.12/x
  3. Step 3: Cross multiply
    121,040.72x = 166,918.92 × 80,756.12
  4. Step 4: Simplify right side
    121,040.72x = 13,479,724,333.79
  5. Step 5: Solve for x
    x = 13,479,724,333.79/121,040.72
  6. Step 6: Final answer
    x = 111,365.20

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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.