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Finding the Fourth Proportional to 221,285.40, 331,889.70 and 80,971.80

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Solution

The fourth proportional to 221,285.40, 331,889.70 and 80,971.80 is: 121,443.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,285.40 : 331,889.70 = 80,971.80 : x
  2. Step 2: Convert to fraction form
    221,285.40/331,889.70 = 80,971.80/x
  3. Step 3: Cross multiply
    221,285.40x = 331,889.70 × 80,971.80
  4. Step 4: Simplify right side
    221,285.40x = 26,873,706,410.46
  5. Step 5: Solve for x
    x = 26,873,706,410.46/221,285.40
  6. Step 6: Final answer
    x = 121,443.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.