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Finding the Fourth Proportional to 219,991.20, 329,991.92 and 53,780.64

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Solution

The fourth proportional to 219,991.20, 329,991.92 and 53,780.64 is: 80,672.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,991.20 : 329,991.92 = 53,780.64 : x
  2. Step 2: Convert to fraction form
    219,991.20/329,991.92 = 53,780.64/x
  3. Step 3: Cross multiply
    219,991.20x = 329,991.92 × 53,780.64
  4. Step 4: Simplify right side
    219,991.20x = 17,747,176,652.43
  5. Step 5: Solve for x
    x = 17,747,176,652.43/219,991.20
  6. Step 6: Final answer
    x = 80,672.21

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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.