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Finding the Fourth Proportional to 121,058.69, 166,991.83 and 72,647.62

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Solution

The fourth proportional to 121,058.69, 166,991.83 and 72,647.62 is: 100,212.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,058.69 : 166,991.83 = 72,647.62 : x
  2. Step 2: Convert to fraction form
    121,058.69/166,991.83 = 72,647.62/x
  3. Step 3: Cross multiply
    121,058.69x = 166,991.83 × 72,647.62
  4. Step 4: Simplify right side
    121,058.69x = 12,131,558,409.85
  5. Step 5: Solve for x
    x = 12,131,558,409.85/121,058.69
  6. Step 6: Final answer
    x = 100,212.21

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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.