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Finding the Fourth Proportional to 121,379.78, 181,943.32 and 67,993.49

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Solution

The fourth proportional to 121,379.78, 181,943.32 and 67,993.49 is: 101,919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,379.78 : 181,943.32 = 67,993.49 : x
  2. Step 2: Convert to fraction form
    121,379.78/181,943.32 = 67,993.49/x
  3. Step 3: Cross multiply
    121,379.78x = 181,943.32 × 67,993.49
  4. Step 4: Simplify right side
    121,379.78x = 12,370,961,308.99
  5. Step 5: Solve for x
    x = 12,370,961,308.99/121,379.78
  6. Step 6: Final answer
    x = 101,919.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.