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Finding the Fourth Proportional to 291,043.54, 436,563.96 and 80,680.78

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Solution

The fourth proportional to 291,043.54, 436,563.96 and 80,680.78 is: 121,020.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,043.54 : 436,563.96 = 80,680.78 : x
  2. Step 2: Convert to fraction form
    291,043.54/436,563.96 = 80,680.78/x
  3. Step 3: Cross multiply
    291,043.54x = 436,563.96 × 80,680.78
  4. Step 4: Simplify right side
    291,043.54x = 35,222,320,812.69
  5. Step 5: Solve for x
    x = 35,222,320,812.69/291,043.54
  6. Step 6: Final answer
    x = 121,020.80

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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.