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Finding the Fourth Proportional to 221,790.80, 331,908.60 and 154,917.20

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Solution

The fourth proportional to 221,790.80, 331,908.60 and 154,917.20 is: 231,832.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,790.80 : 331,908.60 = 154,917.20 : x
  2. Step 2: Convert to fraction form
    221,790.80/331,908.60 = 154,917.20/x
  3. Step 3: Cross multiply
    221,790.80x = 331,908.60 × 154,917.20
  4. Step 4: Simplify right side
    221,790.80x = 51,418,350,967.92
  5. Step 5: Solve for x
    x = 51,418,350,967.92/221,790.80
  6. Step 6: Final answer
    x = 231,832.66

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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.