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Finding the Fourth Proportional to 451,007.78, 621,891.99 and 287,405.12

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Solution

The fourth proportional to 451,007.78, 621,891.99 and 287,405.12 is: 396,301.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,007.78 : 621,891.99 = 287,405.12 : x
  2. Step 2: Convert to fraction form
    451,007.78/621,891.99 = 287,405.12/x
  3. Step 3: Cross multiply
    451,007.78x = 621,891.99 × 287,405.12
  4. Step 4: Simplify right side
    451,007.78x = 178,734,940,069.58
  5. Step 5: Solve for x
    x = 178,734,940,069.58/451,007.78
  6. Step 6: Final answer
    x = 396,301.24

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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.