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Finding the Fourth Proportional to 351,804.10, 485,224.01 and 221,019.78

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Solution

The fourth proportional to 351,804.10, 485,224.01 and 221,019.78 is: 304,840.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    351,804.10 : 485,224.01 = 221,019.78 : x
  2. Step 2: Convert to fraction form
    351,804.10/485,224.01 = 221,019.78/x
  3. Step 3: Cross multiply
    351,804.10x = 485,224.01 × 221,019.78
  4. Step 4: Simplify right side
    351,804.10x = 107,244,103,940.92
  5. Step 5: Solve for x
    x = 107,244,103,940.92/351,804.10
  6. Step 6: Final answer
    x = 304,840.40

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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.