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Finding the Fourth Proportional to 393,690.96, 543,287.39 and 221,608.56

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Solution

The fourth proportional to 393,690.96, 543,287.39 and 221,608.56 is: 305,816.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,690.96 : 543,287.39 = 221,608.56 : x
  2. Step 2: Convert to fraction form
    393,690.96/543,287.39 = 221,608.56/x
  3. Step 3: Cross multiply
    393,690.96x = 543,287.39 × 221,608.56
  4. Step 4: Simplify right side
    393,690.96x = 120,397,134,001.64
  5. Step 5: Solve for x
    x = 120,397,134,001.64/393,690.96
  6. Step 6: Final answer
    x = 305,816.35

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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.