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Finding the Fourth Proportional to 393,651.65, 543,237.93 and 221,569.51

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Solution

The fourth proportional to 393,651.65, 543,237.93 and 221,569.51 is: 305,765.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,651.65 : 543,237.93 = 221,569.51 : x
  2. Step 2: Convert to fraction form
    393,651.65/543,237.93 = 221,569.51/x
  3. Step 3: Cross multiply
    393,651.65x = 543,237.93 × 221,569.51
  4. Step 4: Simplify right side
    393,651.65x = 120,364,960,605.42
  5. Step 5: Solve for x
    x = 120,364,960,605.42/393,651.65
  6. Step 6: Final answer
    x = 305,765.17

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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.