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Finding the Fourth Proportional to 121,761.79, 168,031.89 and 68,047.70

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Solution

The fourth proportional to 121,761.79, 168,031.89 and 68,047.70 is: 93,906.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,761.79 : 168,031.89 = 68,047.70 : x
  2. Step 2: Convert to fraction form
    121,761.79/168,031.89 = 68,047.70/x
  3. Step 3: Cross multiply
    121,761.79x = 168,031.89 × 68,047.70
  4. Step 4: Simplify right side
    121,761.79x = 11,434,183,641.15
  5. Step 5: Solve for x
    x = 11,434,183,641.15/121,761.79
  6. Step 6: Final answer
    x = 93,906.17

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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.