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Finding the Fourth Proportional to 411,940.20, 617,910.30 and 131,485.80

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Solution

The fourth proportional to 411,940.20, 617,910.30 and 131,485.80 is: 197,228.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,940.20 : 617,910.30 = 131,485.80 : x
  2. Step 2: Convert to fraction form
    411,940.20/617,910.30 = 131,485.80/x
  3. Step 3: Cross multiply
    411,940.20x = 617,910.30 × 131,485.80
  4. Step 4: Simplify right side
    411,940.20x = 81,246,430,123.74
  5. Step 5: Solve for x
    x = 81,246,430,123.74/411,940.20
  6. Step 6: Final answer
    x = 197,228.70

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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.