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Finding the Fourth Proportional to 393,704.23, 543,329.49 and 221,681.34

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Solution

The fourth proportional to 393,704.23, 543,329.49 and 221,681.34 is: 305,930.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,704.23 : 543,329.49 = 221,681.34 : x
  2. Step 2: Convert to fraction form
    393,704.23/543,329.49 = 221,681.34/x
  3. Step 3: Cross multiply
    393,704.23x = 543,329.49 × 221,681.34
  4. Step 4: Simplify right side
    393,704.23x = 120,446,009,404.72
  5. Step 5: Solve for x
    x = 120,446,009,404.72/393,704.23
  6. Step 6: Final answer
    x = 305,930.19

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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.