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Finding the Fourth Proportional to 393,661.65, 543,270.30 and 221,590.71

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Solution

The fourth proportional to 393,661.65, 543,270.30 and 221,590.71 is: 305,804.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,661.65 : 543,270.30 = 221,590.71 : x
  2. Step 2: Convert to fraction form
    393,661.65/543,270.30 = 221,590.71/x
  3. Step 3: Cross multiply
    393,661.65x = 543,270.30 × 221,590.71
  4. Step 4: Simplify right side
    393,661.65x = 120,383,653,951.66
  5. Step 5: Solve for x
    x = 120,383,653,951.66/393,661.65
  6. Step 6: Final answer
    x = 305,804.88

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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.