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Finding the Fourth Proportional to 411,930.60, 617,895.90 and 145,991.40

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Solution

The fourth proportional to 411,930.60, 617,895.90 and 145,991.40 is: 218,987.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    411,930.60 : 617,895.90 = 145,991.40 : x
  2. Step 2: Convert to fraction form
    411,930.60/617,895.90 = 145,991.40/x
  3. Step 3: Cross multiply
    411,930.60x = 617,895.90 × 145,991.40
  4. Step 4: Simplify right side
    411,930.60x = 90,207,487,495.26
  5. Step 5: Solve for x
    x = 90,207,487,495.26/411,930.60
  6. Step 6: Final answer
    x = 218,987.10

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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.