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Finding the Fourth Proportional to 427,579.85, 641,469.51 and 123,980.34

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Solution

The fourth proportional to 427,579.85, 641,469.51 and 123,980.34 is: 185,999.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,579.85 : 641,469.51 = 123,980.34 : x
  2. Step 2: Convert to fraction form
    427,579.85/641,469.51 = 123,980.34/x
  3. Step 3: Cross multiply
    427,579.85x = 641,469.51 × 123,980.34
  4. Step 4: Simplify right side
    427,579.85x = 79,529,607,949.43
  5. Step 5: Solve for x
    x = 79,529,607,949.43/427,579.85
  6. Step 6: Final answer
    x = 185,999.43

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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.