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Finding the Fourth Proportional to 221,781, 306,057.78 and 121,179

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Solution

The fourth proportional to 221,781, 306,057.78 and 121,179 is: 167,227.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,781 : 306,057.78 = 121,179 : x
  2. Step 2: Convert to fraction form
    221,781/306,057.78 = 121,179/x
  3. Step 3: Cross multiply
    221,781x = 306,057.78 × 121,179
  4. Step 4: Simplify right side
    221,781x = 37,087,775,722.62
  5. Step 5: Solve for x
    x = 37,087,775,722.62/221,781
  6. Step 6: Final answer
    x = 167,227.02

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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.