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Finding the Fourth Proportional to 72,917.31, 100,625.90 and 39,383.31

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Solution

The fourth proportional to 72,917.31, 100,625.90 and 39,383.31 is: 54,348.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,917.31 : 100,625.90 = 39,383.31 : x
  2. Step 2: Convert to fraction form
    72,917.31/100,625.90 = 39,383.31/x
  3. Step 3: Cross multiply
    72,917.31x = 100,625.90 × 39,383.31
  4. Step 4: Simplify right side
    72,917.31x = 3,962,981,194.16
  5. Step 5: Solve for x
    x = 3,962,981,194.16/72,917.31
  6. Step 6: Final answer
    x = 54,348.97

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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.