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Finding the Fourth Proportional to 393,644.64, 543,246.89 and 221,573.72

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Solution

The fourth proportional to 393,644.64, 543,246.89 and 221,573.72 is: 305,781.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,644.64 : 543,246.89 = 221,573.72 : x
  2. Step 2: Convert to fraction form
    393,644.64/543,246.89 = 221,573.72/x
  3. Step 3: Cross multiply
    393,644.64x = 543,246.89 × 221,573.72
  4. Step 4: Simplify right side
    393,644.64x = 120,369,231,661.04
  5. Step 5: Solve for x
    x = 120,369,231,661.04/393,644.64
  6. Step 6: Final answer
    x = 305,781.46

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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.