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Finding the Fourth Proportional to 121,467.89, 167,552.19 and 78,379.94

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Solution

The fourth proportional to 121,467.89, 167,552.19 and 78,379.94 is: 108,116.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,467.89 : 167,552.19 = 78,379.94 : x
  2. Step 2: Convert to fraction form
    121,467.89/167,552.19 = 78,379.94/x
  3. Step 3: Cross multiply
    121,467.89x = 167,552.19 × 78,379.94
  4. Step 4: Simplify right side
    121,467.89x = 13,132,729,761.31
  5. Step 5: Solve for x
    x = 13,132,729,761.31/121,467.89
  6. Step 6: Final answer
    x = 108,116.89

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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.