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Finding the Fourth Proportional to 121,287.36, 180,982.42 and 108,679.11

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Solution

The fourth proportional to 121,287.36, 180,982.42 and 108,679.11 is: 162,168.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,287.36 : 180,982.42 = 108,679.11 : x
  2. Step 2: Convert to fraction form
    121,287.36/180,982.42 = 108,679.11/x
  3. Step 3: Cross multiply
    121,287.36x = 180,982.42 × 108,679.11
  4. Step 4: Simplify right side
    121,287.36x = 19,669,008,331.25
  5. Step 5: Solve for x
    x = 19,669,008,331.25/121,287.36
  6. Step 6: Final answer
    x = 162,168.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.