Home / 121,818.20-168,112.80-68,105.48

Finding the Fourth Proportional to 121,818.20, 168,112.80 and 68,105.48

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Solution

The fourth proportional to 121,818.20, 168,112.80 and 68,105.48 is: 93,987.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,818.20 : 168,112.80 = 68,105.48 : x
  2. Step 2: Convert to fraction form
    121,818.20/168,112.80 = 68,105.48/x
  3. Step 3: Cross multiply
    121,818.20x = 168,112.80 × 68,105.48
  4. Step 4: Simplify right side
    121,818.20x = 11,449,402,097.58
  5. Step 5: Solve for x
    x = 11,449,402,097.58/121,818.20
  6. Step 6: Final answer
    x = 93,987.62

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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.