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Finding the Fourth Proportional to 108,542.82, 149,821.61 and 66,122.31

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Solution

The fourth proportional to 108,542.82, 149,821.61 and 66,122.31 is: 91,268.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,542.82 : 149,821.61 = 66,122.31 : x
  2. Step 2: Convert to fraction form
    108,542.82/149,821.61 = 66,122.31/x
  3. Step 3: Cross multiply
    108,542.82x = 149,821.61 × 66,122.31
  4. Step 4: Simplify right side
    108,542.82x = 9,906,550,610.51
  5. Step 5: Solve for x
    x = 9,906,550,610.51/108,542.82
  6. Step 6: Final answer
    x = 91,268.59

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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.