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Finding the Fourth Proportional to 278,221.80, 384,144.66 and 219,991.80

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Solution

The fourth proportional to 278,221.80, 384,144.66 and 219,991.80 is: 303,745.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    278,221.80 : 384,144.66 = 219,991.80 : x
  2. Step 2: Convert to fraction form
    278,221.80/384,144.66 = 219,991.80/x
  3. Step 3: Cross multiply
    278,221.80x = 384,144.66 × 219,991.80
  4. Step 4: Simplify right side
    278,221.80x = 84,508,675,213.79
  5. Step 5: Solve for x
    x = 84,508,675,213.79/278,221.80
  6. Step 6: Final answer
    x = 303,745.70

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1.5x scale

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.