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Finding the Fourth Proportional to 411,893.20, 617,839.80 and 131,438.80

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Solution

The fourth proportional to 411,893.20, 617,839.80 and 131,438.80 is: 197,158.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,893.20 : 617,839.80 = 131,438.80 : x
  2. Step 2: Convert to fraction form
    411,893.20/617,839.80 = 131,438.80/x
  3. Step 3: Cross multiply
    411,893.20x = 617,839.80 × 131,438.80
  4. Step 4: Simplify right side
    411,893.20x = 81,208,121,904.24
  5. Step 5: Solve for x
    x = 81,208,121,904.24/411,893.20
  6. Step 6: Final answer
    x = 197,158.20

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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.