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Finding the Fourth Proportional to 72,945.75, 100,665.15 and 39,411.75

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Solution

The fourth proportional to 72,945.75, 100,665.15 and 39,411.75 is: 54,388.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,945.75 : 100,665.15 = 39,411.75 : x
  2. Step 2: Convert to fraction form
    72,945.75/100,665.15 = 39,411.75/x
  3. Step 3: Cross multiply
    72,945.75x = 100,665.15 × 39,411.75
  4. Step 4: Simplify right side
    72,945.75x = 3,967,389,725.51
  5. Step 5: Solve for x
    x = 3,967,389,725.51/72,945.75
  6. Step 6: Final answer
    x = 54,388.22

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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.