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Finding the Fourth Proportional to 393,578.58, 543,165.91 and 221,513.02

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Solution

The fourth proportional to 393,578.58, 543,165.91 and 221,513.02 is: 305,703.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,578.58 : 543,165.91 = 221,513.02 : x
  2. Step 2: Convert to fraction form
    393,578.58/543,165.91 = 221,513.02/x
  3. Step 3: Cross multiply
    393,578.58x = 543,165.91 × 221,513.02
  4. Step 4: Simplify right side
    393,578.58x = 120,318,321,085.15
  5. Step 5: Solve for x
    x = 120,318,321,085.15/393,578.58
  6. Step 6: Final answer
    x = 305,703.43

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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.