Home / 121,821.78-168,115.26-68,109.75

Finding the Fourth Proportional to 121,821.78, 168,115.26 and 68,109.75

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Solution

The fourth proportional to 121,821.78, 168,115.26 and 68,109.75 is: 93,992.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,821.78 : 168,115.26 = 68,109.75 : x
  2. Step 2: Convert to fraction form
    121,821.78/168,115.26 = 68,109.75/x
  3. Step 3: Cross multiply
    121,821.78x = 168,115.26 × 68,109.75
  4. Step 4: Simplify right side
    121,821.78x = 11,450,288,329.79
  5. Step 5: Solve for x
    x = 11,450,288,329.79/121,821.78
  6. Step 6: Final answer
    x = 93,992.13

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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.