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Finding the Fourth Proportional to 121,728.71, 167,982.19 and 68,013.74

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Solution

The fourth proportional to 121,728.71, 167,982.19 and 68,013.74 is: 93,857.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,728.71 : 167,982.19 = 68,013.74 : x
  2. Step 2: Convert to fraction form
    121,728.71/167,982.19 = 68,013.74/x
  3. Step 3: Cross multiply
    121,728.71x = 167,982.19 × 68,013.74
  4. Step 4: Simplify right side
    121,728.71x = 11,425,097,245.21
  5. Step 5: Solve for x
    x = 11,425,097,245.21/121,728.71
  6. Step 6: Final answer
    x = 93,857.04

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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.