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Finding the Fourth Proportional to 393,690.71, 543,287.05 and 221,608.31

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Solution

The fourth proportional to 393,690.71, 543,287.05 and 221,608.31 is: 305,816.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,690.71 : 543,287.05 = 221,608.31 : x
  2. Step 2: Convert to fraction form
    393,690.71/543,287.05 = 221,608.31/x
  3. Step 3: Cross multiply
    393,690.71x = 543,287.05 × 221,608.31
  4. Step 4: Simplify right side
    393,690.71x = 120,396,921,724.93
  5. Step 5: Solve for x
    x = 120,396,921,724.93/393,690.71
  6. Step 6: Final answer
    x = 305,816.01

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.