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Finding the Fourth Proportional to 407,816.60, 611,724.90 and 221,192.60

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Solution

The fourth proportional to 407,816.60, 611,724.90 and 221,192.60 is: 331,788.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    407,816.60 : 611,724.90 = 221,192.60 : x
  2. Step 2: Convert to fraction form
    407,816.60/611,724.90 = 221,192.60/x
  3. Step 3: Cross multiply
    407,816.60x = 611,724.90 × 221,192.60
  4. Step 4: Simplify right side
    407,816.60x = 135,309,021,115.74
  5. Step 5: Solve for x
    x = 135,309,021,115.74/407,816.60
  6. Step 6: Final answer
    x = 331,788.90

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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.