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Finding the Fourth Proportional to 121,609, 167,820.42 and 68,617

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Solution

The fourth proportional to 121,609, 167,820.42 and 68,617 is: 94,691.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,609 : 167,820.42 = 68,617 : x
  2. Step 2: Convert to fraction form
    121,609/167,820.42 = 68,617/x
  3. Step 3: Cross multiply
    121,609x = 167,820.42 × 68,617
  4. Step 4: Simplify right side
    121,609x = 11,515,333,759.14
  5. Step 5: Solve for x
    x = 11,515,333,759.14/121,609
  6. Step 6: Final answer
    x = 94,691.46

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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.