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Finding the Fourth Proportional to 393,756.22, 543,355.39 and 221,665.28

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Solution

The fourth proportional to 393,756.22, 543,355.39 and 221,665.28 is: 305,882.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,756.22 : 543,355.39 = 221,665.28 : x
  2. Step 2: Convert to fraction form
    393,756.22/543,355.39 = 221,665.28/x
  3. Step 3: Cross multiply
    393,756.22x = 543,355.39 × 221,665.28
  4. Step 4: Simplify right side
    393,756.22x = 120,443,022,224.16
  5. Step 5: Solve for x
    x = 120,443,022,224.16/393,756.22
  6. Step 6: Final answer
    x = 305,882.21

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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.