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Finding the Fourth Proportional to 72,161.82, 99,574.66 and 39,892.07

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Solution

The fourth proportional to 72,161.82, 99,574.66 and 39,892.07 is: 55,046.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,161.82 : 99,574.66 = 39,892.07 : x
  2. Step 2: Convert to fraction form
    72,161.82/99,574.66 = 39,892.07/x
  3. Step 3: Cross multiply
    72,161.82x = 99,574.66 × 39,892.07
  4. Step 4: Simplify right side
    72,161.82x = 3,972,239,306.95
  5. Step 5: Solve for x
    x = 3,972,239,306.95/72,161.82
  6. Step 6: Final answer
    x = 55,046.27

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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.